Alaina's reflection

Okay, so seing as I missed a bunch, I got myself completely lost. So I somewhat understand what we learned this week. Umm.. I understand all of the first part of 10-1. I think it is the addition and subtraction properties. After that, I get lost, especially with 10-3. I understand that you are supposed to plug a degree in for alpha and convert it back to one of the origional equations, but I do not understand what to do when the degree plugged in for alpha is not on the unit circle or trig chart. I really do not understand much about this section so any help would be much obliged. (:

thanksss