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Thread: Please solve 6+6costheta=4sin^2theta?

  1. April 12th 2012, 08:04 PM #1
    tanasaur
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    Please solve 6+6costheta=4sin^2theta?

    please solve 6+6costheta=4sin^2theta

    0<= theta < 2pi
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  2. April 12th 2012, 09:22 PM #2
    princeps
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    Re: Please solve 6+6costheta=4sin^2theta?

    Quote Originally Posted by tanasaur View Post
    please solve 6+6costheta=4sin^2theta

    0<= theta < 2pi
    \sin^2 \theta=1-\cos^2 \theta

    hence :

    6+6\cos \theta=4-4\cos^2 \theta

    2\cos^2 \theta +3\cos \theta+1=0

    substitute : t=\cos \theta and solve quadratic equation .
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