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F2 = 12 N
α = 60°
R = √(F1² + F2² + 2 F1 F2 cos α)
R = √(5² + 12² + 2 . 5 . 12 cos 60)
R = √(25 + 144 + 120 . 1/2)
R = √(25 + 144 + 60)
R = √229
R ≈ 15,13 N