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Equations of two straight lines are xcos...

Equations of two straight lines are `xcos alpha + ysin alpha = p and xcos beta + ysin beta = p'.` Show that the area of the quadrilateral formed by the two lines and the perpendiculars drawn from the origin to the lines is `1/(2sin (B-alpha)) [2pp'-(p2 +p'2) cos(alpha-beta)}.`

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