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Thread: Parametric equation

  1. June 13th 2011, 01:04 AM #1
    Punch
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    Parametric equation

    Given a curve with the parametric equations x=3sec^2\theta and y=2tan\theta, find the equation of the curve.

    y=2tan\theta
    \theta=tan^{-1}\frac{y}{2}

    x=3sec^2\theta
    =3sec^2(tan^{-1}\frac{y}{2})

    How do i combine them into 1 equation?
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  2. June 13th 2011, 01:16 AM #2
    BAdhi
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    Remember,

    \tan{^2x}=\sec{^2x}-1
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