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.

CosDerivative  Damon, Thursday, March 14, 2013 at 1:16pm
yes

CosDerivative  Mark, Thursday, March 14, 2013 at 1:27pm
Thanks!
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