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F1 = 5 N
F2 = 12 N
α = 60
R =?
R^2 = F1^2 + F2^2 + 2.F1.F2.cos 60
R^2 = 5^2 + 12^2 + 2. 5.12.0,5
R^2 = 25 + 144 + 60
R^2 = 229
R = √229
R = 15 ,13 satuan
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