"Understand all the things that are true about a given diagram, choose the right one and re-arrange it to suit you!" Once you know about SOHCAHTOA the next challenge is to find out how to apply it to different problems. After some practice it gets easier to figure out if you need Sin, Cos or Tan, but in the beginning it can be difficult. In any case, you can always make a statement/equation involving each of them. When...