pls show all work. thank you!

1. If sin A = find cos 2A 2. If Cos A = find sin 2A (2, 2, 5 points) 3. Simplify: sin 0 tan 0 cot 0 csc 0 cos 0 4. Simplify: + csc 0 sin 0 sin e 5. Simplify: cos 0 cot 0 + sin 0 sin 0 6. = sec 0 - cos 0 cos 0 ps. (5, 5, 6 points) 7. sec x csc x = tan x + cot x verify 1 1 8. + = 2csc2 0 1 + cos 0 1 - cose 9. 2 sin2 0 - sin 0 - 1 = 0 13 10. tan2 0 - 3 tan 0 = 0 principal values 11. 4 cos2 0 - 1 = 0