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Math Help - Trig Equation Problem

  1. #1
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    Trig Equation Problem

    What values are \theta?

    18\cos\theta + 9\sin^{2}\theta = 0

    9(2\cos\theta + \sin^{2}\theta) = 0

    next move?
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  2. #2
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    Re: Trig Equation Problem

    use sin^2\theta+cos^2\theta=1
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  3. #3
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    Re: Trig Equation Problem

    Quote Originally Posted by muddywaters View Post
    use sin^2\theta+cos^2\theta=1
    I don't have cos^{2}\theta only 2\cos\theta
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  4. #4
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    Re: Trig Equation Problem

    Quote Originally Posted by Jason76 View Post
    I don't have cos^{2}\theta only 2\cos\theta
    try  sin^2\theta=1-cos^2\theta
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  5. #5
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    Re: Trig Equation Problem

    and then try to spot the form of a quadratic equation...
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