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Prove that the product of the lengths of...

Prove that the product of the lengths of the perpendiculars drawn from the points `(sqrt(a^2-b^2),""""0)` and `(-sqrt(a^2-b^2),""""0)` to the line `x/a` `costheta` `+` `y/b` `sintheta=1` is `b^2` .

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CENGAGE ENGLISH-STRAIGHT LINES-All Questions
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