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Math Help - Double and Half Angles

  1. #1
    Junior Member
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    Question Double and Half Angles

    For use a double-angle or half-angle formula to simplify the equation and then find all solutions of the equation in the interval


    x=_________pi
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    Well, then use it, hence 2\sin x\cos x+\cos x=\cos x(2\sin x+1)=0, from here \cos x=0 or 2\sin x+1=0. Each one can be easily solved, do it.
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