Need some clarification in regards to trigonometry.... 1. The problem statement, all variables and given/known data For some reason, I am not seeing the cause of this. In attached problem 1, the Forces of x are described with a cos while forces of y are described with sin. In the second problem, the forces of X use sin and the forces of y use cos...... What am I missing here? Is there a certain topic I can review? Is it because of the quadrants they are in? the triangle they make (I would think obviously, I just don't see it :( ) Some of problem 1 has been cut off so I could attach the files 2. Relevant equations How do I figure out if I'm suppose to use a cos or a sin for x or y?