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Math Help - Eliminating the parameter in parametric equations?

  1. #1
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    Eliminating the parameter in parametric equations?

    Can someone please explain this to me?

    Eliminate the parameter for the equations x=secA, y=tanA

    Thanks for any help!
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  2. #2
    Senior Member apcalculus's Avatar
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    Quote Originally Posted by repete View Post
    Can someone please explain this to me?

    Eliminate the parameter for the equations x=secA, y=tanA

    Thanks for any help!
    Here you can use the identity

    tan^2x + 1 = sec^2x

    so...
    y^2 + 1 = x^2

    Good luck!
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  3. #3
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    Thanks

    Thanks for the help, as I thought it was very simple!
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  4. #4
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    Quote Originally Posted by repete View Post
    Thanks for the help, as I thought it was very simple!
    Thread of related interest: http://www.mathhelpforum.com/math-he...imination.html
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