Precalc!! Question> 1. Which of the following are identities? l. sin(-x) = -sin x ll. cos(-x) = cos x lll. tan(-x) = -tan x IV. cos(-x) = -cos x. Answers> A. l, lll and IV B. lll and IV C. l, ll and lll D. ll only Question> 2. Which of the following expressions is equivalent to (sin x +cot x/cos x) Answers> A. sin x + tan x B. cos x + tan x C. tan x + csc x D. cot x + sin x Question> 3. Which of the following statements are true? l. sin 2x /= 2 sin x ll. sin 2x = sin(x+x) lll. 2 sin x = sin x + sin x IV. sin 2x = sin 2 sin x Answers> A. l only B. l, ll, and lll only C. ll only D. lll only. Question> 4. 2/1-cos 2x is equivalent to: Answers> A. cos^2 x B. sin^2 x C. sec^2 x D. csc^2 x. Question> 5. The trigonometric relation sin (pi/4 + x) -sin (pi/4 - x) is equivalent to: Answers> A. sqrt2 sin x B. sqrt2 cos x C. 2 sin pi/4 D. 2sqrt2 + cos x Question> 6. Given that cos x = 4/5, cos y= 24/25, and x and y are both acute angles, the value of tan(x + y) is.. Answers> A. 4/7 B. 4/3 C. 3/25 D. 4/25 Question> 7. Solve cos x = cos 2x on the domain 0 A. 2pi/3, 4pi/3, 2pi B. pi/3, 5pi/3, 2pi C. 0, pi/3, 5pi/3 D. 0, 2pi/3, 4pi/3