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satellite73Best ResponseYou've already chosen the best response.0
product rule \[(fg)'=f'g+g'f\] use \[f(x)=\sin(x), f'(x)=\cos(x), g(x)=\cos(x), g'(x)=\sin(x)\]
 2 years ago

lalalyBest ResponseYou've already chosen the best response.2
f(x)=cos x g(x)=sin x product rule: d/dx ( f(x)g(x) ) = f'(x)g(x) + f(x) g'(x)
 2 years ago

101Ryan101Best ResponseYou've already chosen the best response.1
dy/dx of cosxsinx = (sinx)(sinx) + cosxcosx = cos^2x  sin^2x = ??
 2 years ago

lalalyBest ResponseYou've already chosen the best response.2
yupp thats right....and cos^2xsin^2x = cos(2x)
 2 years ago

101Ryan101Best ResponseYou've already chosen the best response.1
= (1+cos2x)/2  (1cos2x)/2 = 2(cos2x)2 = yeaaaaeee!
 2 years ago
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