1. Which of the following Is NOT an Identity? a) sin? a+cos? a = 1 c) 1 + cot2 a = csco a b) sin a = tan a * cos a d) 1 - sec? a = tan? a 2. Which of the following is an identity? a) sin (a) cos (a) = (1/2) sin(2 a) c) sin(-a) = sin a b) sin a + cos a = 1 d) tan a = cos a / sin a 3. Which of the following is NOT an identity? a) tan(2 t) = 2 tan (t) c) sin(-t) = - sin(t) b) sin? a = 1 - cos? a d) sec(-t) = sec(t) 4. Which of the following is an identity? a) sin? u = 1 + cos u c) sin2 u = 1 - 1 / sec? u b) cot u = sin u * cos u d) cos(-u) = - cos u 5. Where defined, "scx-1 sin x-1 a) sin x b. - sin x c) cscx d. - cscx 6. Simplify (sex) (tan x + cot x) b. sinx b. sec x C. tan x d. cos x 7. To which of the following is (sing-cosy" equal? cosy b. secy b. secy - 2 sin y c. secy - 2tany d. -2 siny 8. Simplify cotxt) = cotx C. C. - 2cotx secx cscx secx +cscx cotx cotx secx+cotx csex d. secx +cscx secx cscx 9. Which of the following is equivalent to sin(A + 30 + cos(A + 60) b. sin A b. cos A c.V3 sinA + cos A d. V3 cos A 10. Which of the following is equivalent to sin(a + B) + sin(a - B)? b. sin 2a b.sin(a2 - B2) c. 2 sin a sin B d. 2 sin a cos B