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α = 60
F1 = 4
F2 = 5
dit : R ?
dijawab :
R = √(F1²+F2² + 2xF1F2cosα)
= √(4²+5² + 2x4x5xcos60)
= √(16+25 + 2x4x5x1/2)
= √(41 + 20)
= √61
= 7,8 N