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Math Help - Differentiate the following function

  1. #1
    Junior Member
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    Differentiate the following function

    Differentiate the following function. f (x) = 7 x 3 - 6 cos(x)
    f ' (x) =

    Attempt:

    21x^2 - 6sin(x)

    Please help me! thank you!
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  2. #2
    MHF Contributor
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    West Malaysia
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    Quote Originally Posted by miss.strw View Post
    Differentiate the following function. f (x) = 7 x 3 - 6 cos(x)
    f ' (x) =

    Attempt:

    21x^2 - 6sin(x)

    Please help me! thank you!
    HI

    you made a sign error

    Should be 21x^2 + 6 sin x

    Remember when you differentiate cos , you get - sin .
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