11. Which of the following is NOT equal to 5os zx cosx C. cos x - sinx tanx C. 2 cos x - sin x d. sec x - 2sinx cot x d. sec x - 2sin2 xtan x 12. If cosx = = and -" S x 5 2n, then tan 2x = b. 24 25 b. -2 C. - 24 d. _ sin 8 13. If 1-cose _ then 8 =_ b. 15 b. 30 c. 45 d. 60 14. tan - + coty = b. cote b. -2 csc0 C. 2 cot 8 d. 2 csco 15. Which of the following is NOT equivalent to sin 40%? C. V1 - cos240 c. 2 sin 20 cos 20 d. 1+cos 80 1-cos 80' 16. If 2 sin 2x = 3 cos2x and 0 S 2x S -, then x= a. 0.25 b. 0.39 C. 0.49 d. 0.52 17. If 4 sin x + 3 = 0 on 0 S x S 27, then x=_ a. 5.43 b. 0.848 c. 3.990 or 5.435 d. 0.848 or 5.435 18. Solve the equation sin 15x + cos 15x = 0. What is the sum of the three smallest positive solutions? 20 b . 20 d. 21n 19. For all positive angles less than 360, if csc(2x + 30) = cos(3y - 150), the sum of x and y is a. 50 b. 30 c. 95 d. 185 20. Given that cos 35 = a, express sin 2015' in terms of a. Please see figure at the right. e. V1-at 1 + 8 ? f. 1- Q2 g. 1+a h. -V1 - az 357