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res = √(D² + R² + 2 D. R cosα)
res² = D² + R² + 2 D. R cosα
(40√2)² = D² + (5D)² + 2D. 5D cos 53
3200 = D² +25D² + 10D². 0,6
3200 = D² + 25D² + 6D²
32D² = 3200
D² =3200/32 = 100
D = 10 N
R =5D = 50 N