Alright, let me help you:
Take out your calculator, and you will find x=11°18'35.8"
Now 180° < x < 270° , thus the III quadrant, so we add 180° to 11°18'35.8" : giving us 191° 18' 35.8"
I guess you can calculate the rest yourself.
2) This is typical Simpson Formula problem: thus i refer to List of trigonometric identities - Wikipedia, the free encyclopedia
3)This is more or less tricky. You'd best transform sec(x) into an cos(x)-function:
since x belongs to the IV quadrant, the is equal to for x belonging to the I quadrant. Now we do the same as in 1):
You can calculate the rest now i guess: and etcetera
I hope this solves your problem. One advice for trigonometric problems: learn your table of common sin, cos and tan values at common angles, such as: 30°, 60°, 90°. Have trigonometric fun!