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Math Help - Trig equation

  1. #1
    Junior Member
    Joined
    Sep 2009
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    40

    Trig equation

    Can someone please help me solve this equation.

    I seem to get a maths error on my calculator when i put cos^{-1} (-2)

    5cos(x)x+10=0

    (0=<x=<2pi)

    Thanks

    EDIT: Please move to trig thread. I accidentally posted in the wrong one.
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  2. #2
    MHF Contributor
    Joined
    Sep 2008
    From
    West Malaysia
    Posts
    1,261
    Quote Originally Posted by deltaxray View Post
    Can someone please help me solve this equation.

    I seem to get a maths error on my calculator when i put cos^{-1} (-2)

    5cos(x)x+10=0

    (0=<x=<2pi)

    Thanks

    EDIT: Please move to trig thread. I accidentally posted in the wrong one.
    HI

    U mean 5\cos x+10=0 ?? If so ,

    \cos x=-2

    Its math error because the minimum of cos is -1 . Sketch the cos graph , it should be clear to you .
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