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Math Help - Intervals of Increase and Decrease

  1. #1
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    Intervals of Increase and Decrease

    The function is 3x-9sin(x), 0<x<pi

    I found the derivative which is 3- 9cos(x)

    Now how would I find the open intervals of increase and decrease given the domain 0<x<pi as seen above?
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  2. #2
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    Quote Originally Posted by ctran View Post
    The function is 3x-9sin(x), 0<x<pi

    I found the derivative which is 3- 9cos(x)

    Now how would I find the open intervals of increase and decrease given the domain 0<x<pi as seen above?
    Set the derivative equal to 0. Figure out what angle corresponds to that in the domain of 0 to pi, as well as any possible repeats.
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  3. #3
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    Quote Originally Posted by Jameson View Post
    Set the derivative equal to 0. Figure out what angle corresponds to that in the domain of 0 to pi, as well as any possible repeats.
    I did this and found one angle which is arccosine(1/3), how would I go about finding other solutions within this domain?
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