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Math Help - Conic proof using polar equation

  1. #1
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    Conic proof using polar equation

    A straight line passes through the focus of a conic and meets the conic at P and Q.
    Prove that 1/|PF| + 1/|QF| is the same regardless of the choice of line.
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  2. #2
    Senior Member TriKri's Avatar
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    What is F in this case? And I guess you mean a conic section (?).
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  3. #3
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    Quote Originally Posted by TriKri View Post
    What is F in this case? And I guess you mean a conic section (?).
    F is the focus
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