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F1 = 4N
F2 = 6N
α = 60'
Dit: R.....?
R = √F1² + F2² + 2.F1.F2 cosα
R = √4² + 6² + 2.4.6 cos 60
R = √16 + 36 + 48 . 1/2
R = √52 + 24
R = √76