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Let PQR be a triangle of area Delta with...

Let PQR be a triangle of area `Delta` with `a = 2, b = 7//2`, and `c = 5//2`, where a, b and c are the lengths of the sides of the triangle opposite to the angles at P, Q and R, respectively. Then `(2 sin P - sin 2P)/(2 sin P + sin 2P)` equals

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