INSTRUCTORS Raffi Hovasapian John Zhu

John Zhu

John Zhu

Quotient Rule

Slide Duration:

Table of Contents

Section 1: Functions
Definitions & Properties of Functions

11m 26s

Intro
0:00
Definition
0:28
Properties: Vertical Line Test
1:32
Domain
1:38
Range
1:59
Vertical Line test
2:19
Example 1
2:33
Example 2
3:10
Properties: Roots or Zeros
4:04
Finding the Root
4:16
Properties: Forms
5:12
Graphically
5:20
List
5:46
Equation
6:11
Function
6:38
Properties: Odd & Even
7:12
Even Function
7:14
Odd Function
8:25
Properties: Increasing & Decreasing
9:17
Increasing Function
9:22
Decreasing Function
10:21
Graphing

13m 58s

Intro
0:00
Manipulating
0:10
A in the Equation
0:39
B in the Equation
0:44
C & D in the Equation
0:49
Negative values
0:59
Example 1
1:17
Example 2
1:51
Example 3: Absolute Value Functions
3:43
Example 4
4:57
Example 5
6:17
Example 6
8:02
Example 7
9:10
Example 8
11:02
Example 9
11:47
Inverse Functions

6m 47s

Intro
0:00
Inverse
0:08
Definition
0:18
Example: Finding the Inverse
1:03
Example 2
2:29
Example 3
3:12
Example 4
4:41
Polynomial Functions

5m 4s

Intro
0:00
Types of Functions: Polynomials
0:07
No Domain Restrictions
0:12
No Discontinuities
0:19
Degree Test
0:31
Types of Functions: Polynomials
1:17
Leading Coefficient Test
1:33
Leading Coefficient Positive, Even Degree
1:54
Leading Coefficient Positive, Odd Degree
2:13
Leading Coefficient Negative Even Degree
2:34
Leading Coefficient Positive, Odd Degree
2:46
Examples: Types of Functions: Polynomials
3:03
Examples: Types of Functions: Polynomials
4:18
Trigonometric Functions

6m 45s

Intro
0:00
Types of Functions: Trigonometric
0:05
6 Functions To Be Familiar With
0:14
Example 1: SIN
1:38
Example 2: COS
3:22
Example 3: TAN
4:38
Inverse Trigonometric Functions

5m 58s

Intro
0:00
Types of Functions: Trigonometric- Inverse Trig Functions
0:07
Example: Inverse SIN of X
0:45
Example: Inverse Function
2:30
Example: Inverse TAN of X
4:42
Trigonometric Identities

17m 42s

Intro
0:00
Types of Functions: Trigonometric- Trig Identities
0:07
4 Identities
0:24
Pythagorean
0:28
Double Angle
1:10
Power Reducing
1:28
Sum or Difference
1:42
Couple More Identities
1:59
Negative Angle
2:04
Product to Sum
2:39
Example 1: Prove
3:00
Example 2: Simplify Expression
5:02
Example 3: Prove
5:56
Example 4: Prove
8:02
Example 5: Prove With TAN
12:43
Exponential Functions

5m 53s

Intro
0:00
Types of Functions: Exponentials
0:07
General Form
0:10
Special Exponential Function
0:17
Example 1: Using Exponential Properties
0:46
Example 2: Using Exponential Properties
1:58
Example 3: Using Trig Identities & Exponential Properties
3:16
Example 4: Using Exponential Properties
4:37
Logarithmic Functions

7m 8s

Intro
0:00
Types of Functions: Logarithmic
0:06
General Form
0:10
2 Special Logarithmic Func.
0:19
Euler's # / Natural Log
0:27
Logarithmic & Exponential Relationship
0:45
Log form
1:56
Properties
2:09
Example 1: Apply Basic Principle of Log Func.
3:05
Example 2: Use Properties
3:40
Example 3: Regular Log
5:16
Rational Functions

15m 36s

Intro
0:00
Types of Functions: Rational - Definition
0:06
Example 1: Graph Rational Func.
0:36
Example 2: Find Asymptotes of Func.
7:02
Example 3: Find Asymptotes of Func.
8:59
Example 4: Graph Rational Func.
11:08
Conic Sections

14m 58s

Intro
0:00
Types of Conic Sections
0:06
Parabolas
0:19
Circles
1:36
Ellipses
2:40
Hyperbolas
4:42
Complete the Square
6:40
Example: Conic Sections
9:08
Example 2: Conic Sections
10:59
Example 3: Graph Conic Sections
12:21
Section 2: Limits and Continuity
Limit Definition & Properties

7m 15s

Intro
0:00
Definition
0:06
Example: Limit
0:17
Properties
1:13
1st Property
1:21
2nd Property
1:34
Special Property
1:51
Limits
2:36
Explain Example
2:49
Limits Example
4:39
Limits Example
5:21
Solving Limits with Algebra

8m 1s

Intro
0:00
Solving Limits with Algebra
0:07
Example 1: Solve Algebraically
0:30
Solving Limits with Algebra, Example 2
2:28
Solving Limits with Algebra, Example 3
3:18
Solving Limits with Algebra, Example 4
4:56
Solving Limits with Algebra, Example 5
6:26
Rational Limit Rules

3m 16s

Intro
0:00
Rational Limit Rules
0:07
Review of Solving Problem Algebraically
0:08
Limit Rules
0:28
Rule 1
0:35
Rule 2
0:40
Rule 3
0:45
Rational Limit Rules
1:02
Applying 1st Rule
1:22
Rational Limit Rules
1:50
Applying 2nd Rule
2:09
Rational Limit Rules
2:26
Applying 3rd Rule
2:40
One Sided Limits

9m 57s

Intro
0:00
Types of Limits: One-Sided Limit Rules
0:06
Example
0:19
Applying Same Rule
0:34
Rule to Keep In Mind
0:52
Types of Limits: One-Sided Limit Example 1
1:12
Limit of x² From Negative Side
2:11
Types of Limits: One-Sided Limit, Example 2
2:27
Types of Limits: One-Sided Limit, Example 3
4:26
Types of Limits: One-Sided Limit, Example 4
5:47
One-Sided Limit Example: X with Even Degree Polynomial
7:00
One-Sided Limit Example: Entire Denominator Squared
8:09
Special Trigonometric Limits

8m 28s

Intro
0:00
Types of Limits: Special Trig Limits
0:07
Pre-set Rules
0:35
Special Trig Limits, Example 1
0:58
Special Trig Limits, Example 2
2:50
Special Trig Limits, Example 3
3:55
Special Trig Limits, Example 4: With More Degrees
4:57
Special Trig Limits, Example 5
6:21
Limits & Continuity

10m 14s

Intro
0:00
Definition
0:06
3 Rules: f(x) Is Continuous…
0:21
Example 1: Finding Continuity
1:06
Types of Discontinuity
2:44
Jump
2:52
Point
3:24
Essential (Asymptote)
3:47
Removable
4:17
Example 2: Continuity Examples
4:41
Example 3: Continuity Examples
6:13
Example 4: Locate & Identify Type of Discontinuities
8:00
Limits: Multiple Choice Practice

6m 16s

Intro
0:00
Problem 1
0:08
Problem 2
1:51
Problem 3
2:54
Problem 4
4:31
Section 3: Derivatives
Derivative Definition & Properties

4m 11s

Intro
0:00
Definition
0:09
Formal Definition
0:45
Difference Quotient
1:12
Basic Derivatives
1:16
Differentiability
2:54
Basic Rules of Differentiation

7m 7s

Intro
0:00
Basic Rules of Differentiation
0:09
Constant Rule
0:14
Constant Multiple Rule
1:10
Addition and Difference Rule
1:40
Example 1: Constant Rule
2:25
Example 2: Constant Multiple Rule
3:01
Example 3: Constant Multiple Rule
3:35
Example 4: Constant Rule
4:34
Example 5: Constant Multiple Rule
5:03
Example 6
5:33
Power Rule

7m 14s

Intro
0:00
Power Rule
0:07
Power Rule Definition
0:30
Example 1
1:11
Example 2
2:25
Example 3
3:05
Example 4
4:18
Example 5
5:13
Trigonometric Rules

7m 53s

Intro
0:00
Trigonometric Rules
0:07
COS X
0:38
Find Derivative
1:02
Example 1
2:46
Example 2: COS Function
3:09
Example 3: Composite Expression
3:54
Example 4: Sec Function
5:02
Example 5: CSC
5:33
Example 6L COT
6:42
Product Rule

11m 11s

Intro
0:00
Product Rule
0:07
Definition
0:20
Example 1
0:43
Example 2
2:11
Example 3
4:24
Example 4
5:24
Example 5
6:42
Example 6
7:51
Quotient Rule

16m 50s

Intro
0:00
Quotient Rule
0:07
Definition
0:30
Example 1
1:17
Example 2: With No X In Numerator
2:49
Example 3
4:30
Example 4: With Decimals
6:46
Example 5
8:53
Example 6: With Trig Functions
12:55
Chain Rule

19m 48s

Intro
0:00
Chain Rule
0:07
Definition
0:17
Example 1: Applying the Chain Rule
1:33
Example 2
4:25
Example 3
6:02
Example 4
9:25
Example 5
12:47
Example 6
15:27
Higher Order Derivatives

15m

Intro
0:00
Types of Derivatives: Higher Order Derivatives
0:07
1st Derivative / F Prime
0:19
2nd Derivative
0:25
3rd Derivative
0:32
Example 1
1:48
Example 2: Find 3rd Derivative
3:13
Example 3: Acceleration
4:25
Example 4
10:20
Example 5: 2nd Derivative
12:11
Derivatives of Exponential Functions

13m 14s

Intro
0:00
Types of Derivatives: Exponential Functions
0:08
Derivatives: Definition/ Formula
0:28
Example 1
1:25
Example 2
2:47
Example 3
4:13
Example 4
7:11
Example 5
9:23
Example 6
11:06
Derivatives of Logarithmic Functions

11m 30s

Intro
0:00
Types of Derivatives: Logarithmic Functions
0:06
Rule for Logarithmic Functions
0:28
Example 1
0:58
Example 2
3:10
Example 3
4:38
Example 4
7:18
Example 5
8:48
Example 6
9:38
Derivatives of Inverse Trigonometric Functions

16m 54s

Intro
0:00
Types of Derivatives: Inverse Trigonometric Functions
0:06
6 Fundamental Properties of Inverse Trigonometric Functions
0:38
Example 1
2:17
Example 2
3:41
Example 3
5:37
Example 4
7:24
Example 5
10:08
Implicit Differentiation

16m 53s

Intro
0:00
Implicit Differentiation: First Order
0:07
Example 1: Setting Up
0:45
Example 1: Solving
1:41
Implicit Differentiation: Second Order (Ex. 2)
4:55
Example 3: Implicit Differentiation
9:11
Example 4: Implicit Differentiation
9:56
Example 5: Implicit Differentiation With Double Derivative
12:46
Multiple Choice Practice: Derivatives

11m 7s

Intro
0:00
Practice Problem 1
0:09
Answer
3:24
Practice Problem 2
3:36
Answer
6:29
Practice Problem 3
6:42
Answer
8:39
Practice Problem 4
8:43
Answer
9:33
Practice Problem 5
9:41
Answer
10:40
Section 4: Applications of Derivatives
Tangent & Normal Lines

22m 36s

Intro
0:00
Tangent and Normal Lines
0:10
Definition
0:22
Example 1
0:55
Tangent and Normal Lines: Example 2
2:43
Tangent and Normal Lines
5:21
Example 3
5:35
Tangent and Normal Lines: Example 4
9:14
Tangent and Normal Lines: Example 5
12:27
Tangent and Normal Lines: Example 6
15:54
Tangent and Normal Lines: Example 7
19:05
Position Velocity & Acceleration

18m 42s

Intro
0:00
Position, Velocity, and Acceleration
0:10
Position Function
0:14
Velocity Function
0:34
Acceleration Function
1:01
Example 1
1:20
Example 2
6:31
Example Continue: Velocity When Acceleration is Zero
6:32
Example 3: Where Is Particle Changing Directions?
8:16
Example 4: Total Distance Traveled From 0 to 2 Second
11:09
Example 5: Ball Drop Problem
16:40
Related Rates

26m 22s

Intro
0:00
Related Rates
0:06
Finding Rate of Change: Organization & Big Picture
0:23
Example 2: Area of a Circle
1:17
Example 3: Spherical Volume Expanding
4:19
Example 4: Traveling Problem
7:57
Example 5: Square Increase
12:37
Example 6: Standard Related Rates Problem
16:59
Example 7: Standard Related Rates Problem
19:49
Minimum & Maximum

12m 22s

Intro
0:00
Extrema: First Derivative Test
0:09
Example 1
0:46
Example 2: Real World Application/ Cost Function
4:05
Example 3: Minimums & Maximums
7:10
Example 4: Find Critical Points
10:52
Concavity

11m 43s

Intro
0:00
Concavity: Second Derivative Test
0:06
Definition
0:34
Example 1
0:54
Example 2
2:51
Example 3
4:08
Example 4
5:52
Rolles Theorem

8m 28s

Intro
0:00
Rolle's Theorem
0:07
Conditions
0:11
Summary
0:41
Example 1
1:09
Example 2
3:08
Example 3
4:48
Mean Value Theorem

9m 39s

Intro
0:00
Mean Value Theorem
0:06
Rolle's Theorem
0:07
Mean Value Theorem Conditions
0:24
Mean Value Theorem Definition
0:36
Example 1
0:56
Example 2
2:44
Example 3
5:28
Example 4
7:15
Differentials

12m 25s

Intro
0:00
Differentials
0:08
1st Differential Formula
0:29
2nd Differential Formula
0:57
Example 1
1:06
Example 2
3:21
Example 3
5:49
Example 4
7:19
Example 5
9:06
Applications of Derivatives: Multiple Choice Practice

13m 21s

Intro
0:00
Practice Problem 1
0:10
Answer
1:57
Practice Problem 2
2:08
Answer
5:39
Practice Problem 3
5:45
Answer
9:59
Practice Problem 4
10:12
Answer
11:49
Practice Problem 5
11:52
Answer
13:00
Applications of Derivatives: Free Response Practice

10m 22s

Intro
0:00
Practice Problem 1
0:10
Slope
1:30
Tangent Line Equation
2:17
Absolute Minimum
2:24
2 Possible X Points With Minimums
3:15
One Interest Point
4:14
Concavity
4:33
Positive Value = Positive Concavity
4:10
Minimum Point
5:34
Absolute Minimum
6:18
Point(s) of Inflection
6:31
Definition
6:49
2 Points Of Inflection
9:59
Section 5: Integrals
Definition of Integrals

1m 8s

Intro
0:00
Definition
0:09
Definition
0:16
Example
0:20
Integrals of Power Rule

8m 50s

Intro
0:00
Power Rule
0:06
Example 1
0:25
Example 2
2:02
Example 3
2:54
Example 4
3:45
Example 5
4:49
Example 6
6:47
Integrals Basic Rules of Integration

9m 43s

Intro
0:00
Basic Rules of Integration
0:09
Constant Rule
0:22
Example 1
0:40
Addition and Difference Rule
1:40
Example 2
1:58
Example 3: Subtraction/ Difference Rule
2:47
Example 4
3:55
Example 5
5:19
Example 6
7:37
Trigonometric Rules of Integrals

8m 58s

Intro
0:00
Trigonometric Rules
0:09
Integral of SIN
0:38
Example 1: Integral of SIN
1:46
Example 2: Integral of COS
2:38
Example 3: With 2 terms of X
3:06
Example 4: Integral of SEC
4:15
Example 5: Integral of CSC
5:06
Example 6
6:18
Chain Rule

13m 59s

Intro
0:00
Chain Rule
0:07
Example 1
0:37
Example 2
3:17
Example 3
5:09
Example 4
7:53
Example 5
9:40
Example 6
11:39
Integrals of Exponential Functions

12m 52s

Intro
0:00
Types of Integrals: Exponential Functions
0:09
Rule 1
0:30
Rule 2
0:49
Example 1
1:11
Example 2
2:54
Example 3
4:19
Example 4
5:19
Example 5
7:37
Example 6
9:04
Integrals of Natural Logarithmic Functions

13m

Intro
0:00
Types of Integrals: Natural Log Functions
0:09
Example 1
0:49
Example 2
2:06
Example 3
4:01
Example 4
5:37
Example 5
7:30
Example 6
9:05
Integrals of Inverse Trigonometric Functions

8m 29s

Intro
0:00
Types of Integrals: Inverse Trig Functions
0:09
One Property
0:40
Example 1
1:19
Example 2
3:44
Example 3
4:53
Example 4
5:53
Integrals: Multiple Choice Practice

15m 37s

Intro
0:00
Problem 1
0:09
Answer
4:09
Problem 2
4:33
Answer
5:54
Problem 3
5:59
Answer
8:02
Problem 4
8:06
Answer
10:27
Problem 5
10:43
Answer
14:46
Section 6: Applications of Integrals
Fundamental Theorem of Calculus

15m 55s

Intro
0:00
Fundamental Theorem of Calculus: Properties
0:10
Definition of Integral
0:49
Example 1
1:14
Fundamental Theorem of Calculus: Properties
2:40
Rule 1
2:50
Rule 2
3:14
Rule 3
3:33
Rule 4
3:52
Example 2
4:07
Example 3
6:17
Example 4
9:31
Example 5
10:52
Example 6
13:34
Area Under A Curve

18m 34s

Intro
0:00
Area Under Curve
0:07
Definition of Integral
0:09
Left Endpoint
1:17
Right Endpoint
1:47
Midpoints
2:09
Example 1
2:40
Example 2
4:59
Example 3
8:48
Example 4
10:23
Example 5
12:30
Example 6
15:32
Reimann Sums

10m 35s

Intro
0:00
Reimann Sums
0:08
Definition
1:07
Example 1
2:48
Example 2
5:38
Example 3
7:21
Example 4
9:14
Trapezoid Rule

12m 46s

Intro
0:00
The Trapezoid Rule
0:09
Definition: Area Of A Trapezoid
0:26
Terms of Formula
1:35
Example 1
2:11
Example 2
4:29
Example 3
7:22
Example 4
10:01
Mean Value Theorem

11m 22s

Intro
0:00
Mean Value Theorem of Integration
0:06
Example 1
0:53
Example 2
2:29
Example 3
3:48
Example 4
6:02
Second Fundamental Theorem of Calculus

4m 44s

Intro
0:00
Second Fundamental Theorem of Calculus
0:07
Definition
0:39
Example 1
1:08
Example 2
2:07
Example 3
2:48
Example 4
3:23
Area Between Curves

16m 39s

Intro
0:00
Example 1
0:10
Example 2
3:00
Example 3
4:46
Example 4
8:22
Example 5
11:04
Example 6
13:09
Revolving Solids Washer Disk Methods

21m 9s

Intro
0:00
Revolving Solids Washer Disk Methods
0:11
Explanation
0:33
Formula
3:12
Example 1
3:42
Example 2
6:54
Example 3
9:29
Example 4
12:16
Example 5
15:35
Revolving Solids Cylindrical Shells Method

26m 46s

Intro
0:00
Revolving Solids: Cylindrical Shells Method
0:09
Volume Of A Solid
0:25
Formula
2:51
Example 1
2:56
Example 2
7:28
Example 3
11:39
Example 4
17:36
Example 5
21:45
Revolving Solids Known Cross Sections

27m 41s

Intro
0:00
Revolving Solids Known Cross Sections
0:08
Example 1
0:35
Example 2
6:01
Example 3
11:03
Example 4
17:29
Example 5
22:19
Differential Equations Eulers Method

17m 54s

Intro
0:00
Differential Equations
0:08
Example 1
0:30
Differential Equations: Euler's Method
2:33
Rules
2:39
Example 2
3:00
Example 3
5:42
Example 4
9:44
Example 5
14:14
Differential Equations Slope Fields

16m 30s

Intro
0:00
Slope Fields
0:08
What Are Slope Fields
0:21
Example 1
0:42
Example 2
6:30
Example 3
11:17
Application of Integrals: Multiple Choice Practice

14m 19s

Intro
0:00
Practice Problem 1
0:10
Answer
3:46
Practice Problem 2
3:49
Answer
6:20
Practice Problem 3
6:26
Answer
8:02
Practice Problem 4
8:07
Answer
10:58
Practice Problem 5
11:05
Answer
14:06
Application of Integrals: Free Response Practice

9m 14s

Intro
0:00
Problem 1
0:10
Part A
0:24
Part A: Solution
2:04
Part B
2:10
Problem 1, Part B Continue
2:23
Part B: Solution
6:15
Problem 1, Part C
6:58
Part C: Solution
12:40
Problem 2
12:52
Part A
13:02
Part A: Solution
15:34
Part B
16:03
Part B: Solution
18:48
Section 7: Sample AP Test
AP Calculus AB Practice test: Section 1: Multiple Choice Part 1

17m 50s

Intro
0:00
Problem 1
0:20
Problem 2
1:24
Problem 3
2:53
Problem 4
3:56
Problem 5
8:18
Problem 6
9:06
Problem 7
10:14
Problem 8
12:16
Problem 9
14:13
AP Calculus AB Practice test: Section 1: Multiple Choice Part 2

17m 32s

Intro
0:00
Problem 10
0:18
Problem 11
2:26
Problem 12
6:11
Problem 13
7:04
Problem 14
8:06
Problem 15
10:32
Problem 16
11:40
Problem 17
13:00
Problem 18
14:43
AP Calculus AB Practice test: Section 1: Multiple Choice Part 3

22m 14s

Intro
0:00
Problem 19
0:21
Problem 20
2:33
Problem 21
7:23
Problem 22
10:24
Problem 23
12:18
Problem 24
13:13
Problem 25
15:52
Problem 26
17:03
Problem 27
19:44
AP Calculus AB Practice test: Section 1: Multiple Choice Part 4

19m 35s

Intro
0:00
Problem 28
0:23
Problem 29
3:50
Problem 30
5:31
Problem 31
9:02
Problem 32
10:07
Problem 33
11:27
Problem 34
13:47
Problem 35
15:21
Problem 36
16:53
AP Calculus AB Practice test: Section 1: Multiple Choice Part 5

25m 43s

Intro
0:00
Problem 37
0:22
Problem 38
2:27
Problem 39
5:36
Problem 40
7:21
Problem 41
10:08
Problem 42
11:29
Problem 43
13:07
Problem 44
18:18
Problem 45
21:08
AP Calculus AB Practice Test: Section 2: Free Response Part 1

16m 50s

Intro
0:00
Problem 1, Part A
0:20
Problem 1, Part B
3:03
Problem 1, Part C
4:11
Problem 1, Part D
5:36
Problem 2, Part A
7:37
Problem 2, Part B
9:02
Problem 2, Part C
12:31
AP Calculus AB Practice Test: Section 2: Free Response Part 2

21m 36s

Intro
0:00
Problem 3, Part A
0:18
Problem 3, Part B
5:57
Problem 4, Part A
11:26
Problem 4, Part B
12:28
Problem 4, Part C
15:35
Problem 4, Part D
18:56
AP Calculus AB Practice Test: Section 2: Free Response Part 3

13m 39s

Intro
0:00
Problem 5, Part A
0:21
Problem 5, Part B
3:07
Problem 5, Part C
6:43
Problem 6
8:24
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Lecture Comments (3)

0 answers

Post by Steve Denton on October 7, 2012

The above are regarding example 6.

0 answers

Post by Steve Denton on October 7, 2012

After graphing the function, it indeed slopes downward at pi.

so the slope must be negative.

0 answers

Post by Steve Denton on October 7, 2012

I got negative 1 / pi squared on my calculator.

Quotient Rule

  • Organization is vital
  • Write more, more room to think, make less mistakes
  • Careful with distribution of “-” sign when evaluating

Quotient Rule

Given f(x) = 3x and g(x) = 4x, find [d/dx] [f(x)/g(x)]
  • [d/dx] [f(x)/g(x)] = [(g(x)f′(x) − f(x)g′(x))/(g(x)2)]
  • = [(4x [d/dx] 3x − 3x [d/dx] 4x)/((4x)2)]
  • = [(12x − 12x)/(16x2)]
0
Find f′(x) if f(x) = [3x/(x2 + 1)]
  • f′(x) = [3x/(x2 + 1)]
  • = [((x2 + 1) [d/dx] 3x − 3x [d/dx] (x2 + 1))/((x2 + 1)2)]
  • = [((x2 + 1)3 − 3x(2x))/((x2 + 1)2)]
  • = [(3x2 −6x2 + 3)/((x2 + 1)2)]
[(−3 (x2 − 1))/((x2 + 1)2)]
Find the derivative of tan(x) using the quotient rule
  • [d/dx] tan(x) = [d/dx] [sin(x)/cos(x)]
  • = [(cos(x) [d/dx] sin(x) − sin(x) [d/dx] cos(x))/(cos2(x))]
  • = [(cos(x)cos(x) − sin(x) (−sin(x)))/(cos2(x))]
  • = [(cos2(x) + sin2(x))/(cos2(x))]
  • = [1/(cos2(x))]
sec2(x)
Find the derivative of cot(x) using the quotient rule
  • [d/dx] cot(x) = [d/dx] [cos(x)/sin(x)]
  • = [(sin(x) [d/dx] cos(x) − cos(x) [d/dx] sin(x))/(sin2(x))]
  • = [(sin(x) (−sin(x)) − cos(x) cos(x))/(sin2(x))]
  • = −[(sin2(x) + cos2(x))/(sin2(x))]
  • = −[1/(sin2(x))]
−csc2(x)
Find the derivative of sec(x) using the quotient rule
  • [d/dx] sec(x) = [d/dx] [1/cos(x)]
  • = [(cos(x) [d/dx] 1 − 1 [d/dx] cos(x))/(cos2(x))]
  • = [(0 − (−sin(x)))/(cos2(x))]
  • = [sin(x)/(cos2(x))]
  • = sec(x) [sin(x)/cos(x)]
sec(x) tan(x)
Find f′(x) if f(x) = [(x3)/((5x + 4)tan(x))]
  • f′(x) = [((5x + 4) tan(x) [d/dx] x3 − x3 [d/dx] ((5x + 4) tan(x)t))/(t((5x + 4)tan(x))2)]
  • = [((5x + 4) tan(x) (3x2) − x3 [d/dx] ((5x + 4) tan(x)))/((5x + 4)2 tan2(x))]
  • = [((5x + 4) tan(x) (3x2) − x3 ( (5x + 4) [d/dx] tan(x) + tan(x) [d/dx] (5x + 4) ))/((5x + 4)2 tan2(x))]
  • = [((5x + 4) tan(x) (3x2) − x3 ( (5x + 4) sec2(x) + tan(x) 5 ))/((5x + 4)2 tan2(x))]
[((5x + 4) tan(x) (3x2) − x3 ( (5x + 4) sec2(x) + 5tan(x)))/((5x + 4)2 tan2(x))]
Find f′(x) if f(x) = [(√x + 3)/(x4 −16)]
  • f′(x) = [(√x + 3)/(x4 − 16)]
  • = [((x4 − 16) [d/dx] (√x + 3) − (√x + 3) [d/dx] (x4 − 16))/((x4 − 16)2)]
[((x4 − 16) [1/2] x−[1/2] − (√x + 3) (4x3))/((x4 − 16)2)]
Find f′(x) if f(x) = [(.2x6)/(.1x + cos(x))]
  • f′(x) = [((.1x + cos(x)) [d/dx] .2x6 − (.2x6) [d/dx] (.1x + cos(x)))/((.1x + cos(x))2)]
[((.1x + cos(x)) 1.2x5 − .2x6 (.1 − sin(x)))/((.1x + cos(x))2)]
Find f′(t) if f(t) = [(t2)/sin(t)]
  • The letter or symbol used for the variable is not important. What's important is consistency.
  • f′(t) = [(sin(t) [d/dt] t2 − t2 [d/dt] sin(t))/(sin2(t))]
  • = [(sin(t) (2t) − t2 cos(t))/(sin2(t))]
[(t(2sin(t) − t cos(t)))/(sin2(t))]
Find f′(1) if f(z) = [(z − 3)/(2 − z)]
  • f′(t) = [((2 − z) [d/dz] (z − 3) − (z − 3) [d/dz] (2 − z))/((2 − z)2)]
  • = [((2 − z) 1 − (z − 3) (−1))/((2 − z)2)]
  • = [(2 − z + z − 3)/((2 − z)2)] =
−[1/((2 − z)2)]

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

Answer

Quotient Rule

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  • Intro 0:00
  • Quotient Rule 0:07
    • Definition
    • Example 1
  • Example 2: With No X In Numerator 2:49
  • Example 3 4:30
  • Example 4: With Decimals 6:46
  • Example 5 8:53
  • Example 6: With Trig Functions 12:55
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