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For more information, please see full course syllabus of Calculus AB

For more information, please see full course syllabus of Calculus AB

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Post by Lifan Yu on September 25, 2015

I think he's actually correct in the last example.

-8sin^2x+8cos^x = -8sin^2x-8cos^2x+16cos^x = -8+16cos^x. (Using pythagorean identity)

All the other terms match up.

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Post by John Zhu on August 12, 2013

There is definitely a mistake in there. Final answer is a bit long winded, but here it is:

30x^4-2x^3cos(x)+18x^2sin(x)-48xcos(x)+8cos^2(x)-8sin^2(x).

Thanks for spotting the error folks, a good example of how organization and sleep the night before the test helps boost scores!

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Post by Si Jia Wen on August 10, 2013

I think he made a mistake in the last example...

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Post by Cho HyuJang on November 10, 2012

Thaz the thing i wanna ask too? how did he get it?

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Post by Steve Denton on October 7, 2012

How did he simplify that to 16cos(sq)x + . . . . - 8 ???? The first and last terms came out of nowhere to me.