If p and q are the lengths of perpendiculars from the origin to the lines x cos theta minus y sin th...........

If p and q are the lengths of perpendiculars from the origin to the lines x cos θ − y sin θ = k cos 2θ and x sec θ + y cosec θ = k, respectively, prove that p2 + 4q2 = k2 (3 marks)

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