Prove that the lines of x = py + q, z = ry + s and x = p' y + q', z = r' y + s' are perpendicular, if pp' + rr' + 1

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Q 1769391215.     Prove that the lines of x = py + q, z = ry + s and x = p' y + q', z = r' y + s' are perpendicular, if pp' + rr' + 1 = 0`.

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