Which is the correct force equilibrium equation along the y direction?
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∑Fy=Ay+By+Cy+450cos(40)=0∑Fy=Cy+450sin(40)=0∑Fy=Cy+450cos(40)=0∑Fy=Cy+450sin(40)−300=0∑Fy=Ay+By+Cy+450sin(40)=0∑Fy=Cy+450cos(40)−300=0
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