The resultant of two forces P and Q acting at an angle θ is making an angle to with force P then
Atan α = Psinθ/(P+ Q cosθ)
Btan α = Pcosθ/(P+ Q cosθ)
Ctan α = Qsinθ/(P+ Q cosθ)
Dtan α = Qcosθ/(P+ Q sinθ)
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