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Math Help - I need help solving this trig problem

  1. #1
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    I need help solving this trig problem

    I have to determine the angle that satisfies the following equation:

    cos(x)=-2tan(x)

    All I have managed to do is reexpress this as:

    (cos(x))^2 + 2sin(x) = 0

    However, I don't think this helps me? I am quite stuck with this problem and am not sure how to approach it. A worked solution would be greatly appreciated.
    Last edited by mr fantastic; February 7th 2011 at 03:12 AM. Reason: Restored deleted question.
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  2. #2
    MHF Contributor
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    If you replace (cos(x))^2 by 1 - (sin(x))^2, you will get a quadratic equation on sin(x).
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  3. #3
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    Thank you very much for your reply
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