heatherh294
Find local min and max and the points of inflection for
f(x)= 3(cos(x))^2  6sin(x)



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freewilly922
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Do you know how to do the chain rule with respect to trig functions?

freewilly922
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Example
\[ \bigg(\cos^4(x)\bigg)^{\prime}=4\cos^3(x)\]

freewilly922
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oh and generally
\[\cos^2(x) = (\cos(x))^2\]

anonymous
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?

anonymous
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let me write it correctly
\[f'(x)=6\cos(x)\sin(x)6\cos(x)]\] that's better

myininaya
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\[\(cos^2(x))'=2\cos(x)(\sin(x))=2\cos(x)\sin(x)\]

myininaya
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@freewilly922 your example is a little off

anonymous
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mine was way off!

myininaya
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Corrected example from above:
\[(\cos^4(x))'=4\cos^3(x)(\sin(x))=4\cos^3(x)\sin(x)\]

anonymous
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i just ate a mini kitkat