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Math Help - Derivatives

  1. #1
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    Post Derivatives

    Using the derivative or graph of the chosen pair of frequencies (in this case f1=10 , f2=8) determine 3 occasions (values of x) when it is stationary(not moving).

    So derivative is -18cos(x)sin(9x)-2sin(x)cos(9x)
    2nd derivative is (if any help) 36sin(x)sin(9x)-164cos(x)cos(9x)

    graph of function will be attached.

    then verify that the times are accurate by making appropriate substitutions and calculations.

    plz help and explain steps done.
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  2. #2
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    Quote Originally Posted by Buzzins View Post
    Using the derivative or graph of the chosen pair of frequencies (in this case f1=10 , f2=8) determine 3 occasions (values of x) when it is stationary(not moving).

    So derivative is -18cos(x)sin(9x)-2sin(x)cos(9x)
    2nd derivative is (if any help) 36sin(x)sin(9x)-164cos(x)cos(9x)

    graph of function will be attached.

    then verify that the times are accurate by making appropriate substitutions and calculations.

    plz help and explain steps done.
    By definition, a stationary point is a point at which the derivative is zero. Set the derivative to zero and solve for x.
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