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

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