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Math Help - solve

  1. #1
    Newbie
    Joined
    Apr 2009
    Posts
    21

    solve

    How do i solve the equation:

    3 cos x - sin x/2 - 1 = 0

    in the interval 0<x<720

    Thx!
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  2. #2
    MHF Contributor
    Joined
    Nov 2008
    From
    France
    Posts
    1,458
    Hi

    \cos x = 1 - 2\sin^2\left(\frac{x}{2}\right)

    which leads to a quadratic in \sin\left(\frac{x}{2}\right)
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