determine the magnitude of the force F to prevent the pole from rotating

If the man at B exerts a force of P = 30 lb on his
rope, determine the magnitude of the force F the man at C
must exert to prevent the pole from rotating, i.e., so the

[roronoazoro]

how to to differentiate on using cos or sin?

[mikeloto]

question? you mentioned something about Y components of P and the force, could you explain why we don't suppose to use it please

[shrinivasrao]

This problems says what moment of force actually is.