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40 / sin (90+30) = T₁ / sin (180 - 30) = T₂ / sin 90
40 / (1/2 √3) = T₁ /0,5 = T₂ / 1
T₁ = 40/√3 = 40/3 √3 N
T₂ = 80/√3 = 80/3 √3 N
T₂ / sin (90+60) = T₄ / sin 60 = T₃ / sin ((90-60)+(90+30))
T₂ / 0,5 = T₄ /1/2 √3 = T₃ / 0,5
T₂ = T₃ = 80 √3
T₄ = ( 80 √3 /0,5 ) x 1/2√3 = 80 N