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Math Help - Differentiating Cos^3

  1. #1
    Newbie khanim's Avatar
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    Differentiating Cos^3

    Hi Guys

    This is a length of curve question, but I dont know how to differentiate 2 cos^3 x or  2sin^3 x


    Can anyone please help
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  2. #2
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    Quote Originally Posted by khanim View Post
    Hi Guys

    This is a length of curve question, but I dont know how to differentiate 2 cos^3 x or  2sin^3 x


    Can anyone please help
    use chain rule
    hint : \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)
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  3. #3
    Newbie khanim's Avatar
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    Thx Ramiee2010

    Chain rule, got it
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