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 cos theta + y/b sin theta = 1 " is " b^(2)`.

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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 cos theta + y/b sin theta = 1 " is " b^(2)`.

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