1 5x243X FAX 7. Verify the given identity: (Show all steps of the proof in vertical form.) csc 0 - cot 0 . cos 0 = sin e 8. Verify the given identity: (Show all steps of the proof in vertical form.) sec x CSC X = tan x - cotx csc x sec x 9. Find cos 150 . (Use the sum or difference identities and show all steps.) 10. Find the sin . (Use the sum or difference identities and show all steps.) 11. Verify that cos(180 + 0) = - cos 0. (Show all steps of the proof) 12. If sin 0 = - = and 0 in quadrant IV, find sin 20. (Show your work.)