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I have a homework problem I can't understand:

A 125-N sign is supported by a lightweight pole and cable as shown in the diagram. What is the tension in the cable?

the diagram resembles |>

the | is a wall, the top of > is the cable and the bottom is the pole, and the sign hangs from point at the right.

The pole makes a 40 degree with the wall, and the cable is 50 degrees, so where the pole and cable meet is a right angle.

can anyone give a hint on how to solve that?

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# Tension on cable

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