Hi Guys This is a length of curve question, but I dont know how to differentiate $\displaystyle 2 cos^3 x$ or $\displaystyle 2sin^3 x$ Can anyone please help
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Originally Posted by khanim Hi Guys This is a length of curve question, but I dont know how to differentiate $\displaystyle 2 cos^3 x$ or $\displaystyle 2sin^3 x$ Can anyone please help use chain rule hint : $\displaystyle \frac{d}{dx}( \cos^3 x)= \frac{d( \cos^3 x) } {d (\cos x)} \cdot \frac{d( \cos x)}{dx}=3 ( \cos^2 x) (- \sin x)$
Thx Ramiee2010 Chain rule, got it
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