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Math Help - 2nd derivative test

  1. #1
    Junior Member
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    2nd derivative test

    I am having trouble with this problem :

    use the second derivative test to find all relative extrema of f(x)=2sin(x)+cos(2x)

    I differentiated and got to 2cos(x)-2sin(2x)

    what should I do next?
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  2. #2
    A Plied Mathematician
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    You'll need the second derivative to see whether a given extremum is a max or a min. So take the second derivative.
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