Sine and cosine functions are mostly used in terms of right triangles. There are special formulas on how to use them and you can master these formulas, by using the Sohcahtoa. Understanding what a Unit Circle is will help clarify where the sine and cosine functions are. Unit Circle is a circle with a radius of one. When you draw an angle θ in a standard position (starting on the positive x-axis), the coordinates of its terminal side on the unit circle are the cosine and the sine of θ. The x-coordinate is cosine and the y-coordinate is sine. In this lecture you'll learn when the function is odd and when it's even and you'll also practice graphing sine and cosine functions.
*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.
Sine and Cosine Functions
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.