Wednesday
April 23, 2014

Homework Help: Cos-Derivative

Posted by Mark on Thursday, March 14, 2013 at 12:49pm.

y= (cos^3 x) (cos 3x)

I got -3 sin(3x) cos^3x - 3 sin(x) cos (3x) cos^2 (x) using the product rule

Is this right? Thanks.

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