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Question: for this problem i just need to know when i...

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For this problem, I just need to know when I am solving for the equations of equilibrium, how to know whether it is positive or negative when calculating F_x and F_y and when to know whether to use cos or sin for the angle and force. I understand how to solve the problem but differentiating between cos and sin and when it is positive and negative confuses me. Can someone help me understand.

1-58. RodsAB and BC have diameters of 4 mm and 6 mm, respectively. If the 3 kN force is applied to the ring at B. determine the angle θ so that the average normal stress in each rod is equivalent. What is this stress? 5 4 3 kN Prob. 1-58

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