The restaurant of two forces P and Q actingat an angle θ makes an angle a with P 'a' is given by
ATan a= Q sinθ / (P+Qcos θ)
BTan a= P sinθ / (P+Qcos θ)
CTan a= P sinθ / (P-Qcos θ)
DTan a= Q sinθ / (P-Qcos θ)
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