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F1 = 10 N
F2 = 5 N
α = 30
S = ?
S^2 = F1^2 + F2^2 - 2.F1.F2.cos 30
S^2 = 10^2 + 5^2 - 2.10.5.0,87
S^2 = 100 + 25 - 87
S^2 = 125 - 87
S^2 = 38
S = √38
S = 6,164
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