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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- Nov 7th 2009, 07:39 AMkevinlightmanConic 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. - Nov 7th 2009, 10:37 AMTriKri
What is F in this case? And I guess you mean a conic section (?).

- Nov 8th 2009, 06:25 AMkevinlightman