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If p and p1 be the lengths of the perpen...

If `p and p_1` be the lengths of the perpendiculars drawn from the origin upon the straight lines `x sin theta + y cos theta = 1/2 a sin 2 theta and x cos theta - y sin theta = a cos 2 theta`, prove that `4p^2 + p^2_1 = a^2`.

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