Applied Mechanics and Graphic Statics
If the resultant of two forces ‘P’ and ‘Q’ acting at an angle ‘θ’ makes an angle ‘α’ with ‘P’, then tan α equals

Q sin θ/P + Q cos θ
Q sin θ/P + Q sin θ
P sin θ/P - Q cos θ
P sin θ/P + Q tan θ

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