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F1 = F2 = 12 N
R = 12 N
Dit: θ....?
R² = F1² + F2² + 2.F1.F2 cosθ
12² = 12² + 12² + 2 x 12 x 12 cosθ
144 = 144 + 144 + 288 cosθ
144 = 288 + 288 cosθ
144 - 288 = 288 cosθ
-144 = 288 cosθ
cosθ = - 144/288
cosθ = -1/2
θ = 120'
jd sudut apit vektor tersebut 120'