Inverse of Trigonometric Functions help

Let sin x = .93 and cos y = .29. Which is x + y?

A. sin–1.93 + cos–1.29

B. in–1.93 – cos–1.29

C. –sin–1.93 – cos–1.29

D. –sin.93 – cos.29


Let cos x = .28 and cos y = .74. Which is x – y?

A. cos–1.28 + cos–1.74

B. –cos–1.28 – cos–1.74

C. cos–1.28 – cos–1.74

D. –cos–1.28 + cos–1.74

Let sin x = .16. Then:

A. x = cos–1 .16

B. x = cos–1 .99

C. x = sin .99

D. x = –sin .16

If which is cot 30 = v3 which is cot 330 ?

A. - v 3

B. v 3

C. 2 v 3

D. - 2 v 3

Let cos45 = v 2 / 2 . Which is cos135?

A. - v 2/ 3

B. v 2 / 2

C. v 2 / 3

D. - v 2 / 2

OK Jim---
You've asked a lot of questions in one post.
#1. Answer is A. Both values for sin and cos are in Q1
#2. Answer is C. Cos is + in 1Q and 4Q
#3. Answer is B. but I got 0.987 not 0.99
#4. Answer is A. Cot is just the inverse of tan and is - in Q4.
#5. Answer is D. Cos is - in Q2 and is even function.