February 22, 2017

Homework Help: Derivatives

Posted by Daisy on Thursday, October 3, 2013 at 3:52am.

Find the derivatives of:

1. H(x)= sin2xcos2x

The answer given is 2cos4x. My question is, how in the world did they get that!? Shouldn't the answer at least contain the sin function, either negative or positive seeing as it's the derivative of cos? Also, which rules are involved in this problem? Product and chain rule?

2. f(x)= (cotx) / (sinx)
I ended up with a mess of an answer that no where near resembled the solution.

Any help would be greatly appreciated! :)

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