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Math Help - Calculus Derivatives (confused)

  1. #1
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    Calculus Derivatives (confused)

    I under stand the chain rule and all.. but I have never seen derivatives envolving trig fuctions.

    I have g(x)=x^2cos(x)

    so is this right?

    2*X*cos(x)
    so
    2xcos(x)

    Really confused, would greatly appreciate it if someone could guide me through the problem.
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  2. #2
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    Quote Originally Posted by Marker View Post
    but I have never seen derivatives envolving trig fuctions.

    I have g(x)=x^2cos(x) so is this right?
    2*X*cos(x)
    so
    2xcos(x)
    No it is not correct.
    You statement is very hard to believe.
    You do have a textbook. The derivatives of trig functions are discussed in it.
    Look them up.
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  3. #3
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    I don't have my text book.

    but I figured it out.

    /thread.
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  4. #4
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    Quote Originally Posted by Marker View Post
    I under stand the chain rule and all.. but I have never seen derivatives envolving trig fuctions.

    I have g(x)=x^2cos(x)

    so is this right?

    2*X*cos(x)
    so
    2xcos(x)

    Really confused, would greatly appreciate it if someone could guide me through the problem.
    Is it g(x)=x^(2cos(x)) or g(x)= (x^2) cos(x). If the latter, use the product rule and note the advice given earlier.
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  5. #5
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    it was the latter, but I figured it out. Thanks anyway.
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