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F1 = 3
F2 = 4
R = 5
dit : α ?
dijwab :
R = √(F1²+F2² + 2xF1F2cosα)
5² = 3² + 4² + 2x3x4 cosα
25 = 9+16 + 24 cosα
25 - 25 = 24 Cos α
0 = 24 cosα
cos α = 0/24
cos α = 0
α = 90° (D)