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V1 = 8
V2 = 6
α = 60
dit ; R ?
dijawab :
R = √(V1²+V2² + 2V1V2 x cos α)
= √(8²+6² + 2x8x6x cos 60)
= √(64+36 + 2 x 8 x 6 x 1/2)
= √148