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A = 8 N
B = 6 N
α = 60⁰
R = ?
R^2 = A^2 + B^2 + 2.A.B.cos 60⁰
R^2 = 8^2 + 6^2 + 2.8.6.0,5
R^2 = 64 + 36 + 48
R^2 = 148
R = √148
R = 12,165 satuan