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Math Help - Maxima and minima trig problem

  1. #1
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    Maxima and minima trig problem

    I am having a problem trying to figure out the maxima and minima points of the function:
    y=cosx(1+sinx), [0, 2\pi]
    I got to the derivative:
    2sin^2x+sinx=-1
    But I don't know what to do from there. Any help would be appreciated.
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  2. #2
    Senior Member
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    Nov 2009
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    It's a quadratic

    Your final equation is a quadratic - use the quadratic equation to find the roots.

    By the way, check your derivative. I seem to be getting a +1.
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