Problem 347
Repeat Problem 346 if the cable pulls the boom AB into a position at which it is inclined at 30° above the horizontal. The loads remain vertical.
 

Cable and boom structure

 

Solution 347

 
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In reply to by Jerrie Vy Subaldo

I am not sure which line in the solution you are referring. Are you referring to AH = T cos θ? It is the only line involving cos 60°. If yes, this is the reason:

The component of T in the horizontal direction is Tx = T cos 180° or equal to T cos 60° if you just equate rightward and leftward forces.

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