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F₁ = 4 N
F₂ = 3 N
α = 60°
R = __ ?
R = √ (F₁² + F₂² + 2 F₁ F₂ cos α)
R = √ (4² + 3² + 2 · 4 · 3 cos 60°)
R = √ (16 + 9 + 12)
R = √37 N