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ABCD is a trapezium such that AB and CD are parallel and BCCD. If ADB=θ,BC=p and CD=q, then AB is equal to :

(1)(p2+q2)sinθpcosθ+qsinθ(2)p2+q2cosθpcosθ+qsinθ(3)p2+q2p2cosθ+q2sinθ(4)(p2+q2)sinθ(pcosθ+qsinθ)2

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