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= F₁r₁ + F₂r₂ - F₃r₃
= (10)b + (9)b - (12)cos 30° . a
= (10)(0.25) + (9)(0.25) - (12)(1/2 √3)(0.1)
= 2.5 + 2.25 - 0.6√3
Σζ = 2.75 - 0.6√3 ≈ 0.426 Nm