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Math Help - trig equation

  1. #1
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    trig equation

    solve trig equation

    3(cos x-1) = -1

    thanks
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  2. #2
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    Feb 2008
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    Quote Originally Posted by gracey View Post
    solve trig equation

    3(cos x-1) = -1

    thanks
    hello

    from above:
    cos x-1=-1/3
    cos x=-1/3 +1
    cos x=2/3
    x= inv (cos2/3)
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