Ononot — Let L1 be the line x \cos \alpha + y \sin \alpha = p1 and L2

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Coordinate Geometryhard

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Let $L_1$ be the line $x \cos \alpha + y \sin \alpha = p_1$ and $L_2$ be the line $x \cos \beta + y \sin \beta = p_2$ . If $L_1$ and $L_2$ are perpendicular, the distance between the point of intersection of these two lines and the origin is given by which expression?