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Math Help - Extrem values

  1. #1
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    Mar 2010
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    Extrem values

    A little help please
    I have absolutely no idea what to do..

    Give, in exact form, the coordinates for the maxpositions in this curve:

    y = 2 sin x - x

    In the intervall  0 < x < 2 pi


    You have to excuse my incorrect english and grammar...

    Best Regards
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  2. #2
    Super Member
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    Ffind the derivative of y with respect to x and equate to zero. Find he value of x.

    y = 2sin(x) - x.........(1)
    dy/dx = 2cos(x) - 1 = 0
    cos(x) = 1/2.
    Now find all possible values of x.
    Substitute the values of x in eq.(1) to get the y values.
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  3. #3
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    Aha!

    Thx a million
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