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Math Help - Solving a trig equation

  1. #1
    Junior Member
    Joined
    Nov 2009
    From
    Ornskoldsvik
    Posts
    33
    How about this one..

    cos(theta/2) = 1/2

    I know that 1/2 is 60 degrees. and it's using the half angles. But I don't know how to solve it.
    Last edited by mr fantastic; November 29th 2009 at 12:51 AM. Reason: Moved from another thread.
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