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F2 = 8 N
R = 7 N
∅ ... ?
R² = F1² + F2² + 2xF1xF2 cos α
7² = 3² + 8² + 2x3x8 cos α
49 = 9 + 64 + 48 cos α
-24 = 48 cos α
-0,5 = cos α
arc cos (-0,5) = α
120° = α