what is the derivative of cos squared of x? is it -2 sin x? thx in advance
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Originally Posted by slapmaxwell1 what is the derivative of cos squared of x? is it -2 sin x? thx in advance No it isn't - recall the chain rule $\displaystyle \frac{d}{dx} \, cos^2(x) = -2cos(x)sin(x) = -sin(2x)$ ============================== $\displaystyle \frac{d}{dx} \, cos(x^2) = -2xsin(x^2)$
Last edited by e^(i*pi); Jan 16th 2010 at 09:20 AM. Reason: added in d/dx cos(x^2)
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