Math
posted by Nikki .
Which of the following are examples of multiplicative inverses?
1) csc x and sin x
2) tan x and cot x
3) cos^1 and cos x
4) ln x and e^x
A. All of these
B. 1 and 2
C. 1,2, and 3
D. 3 and 4
I know it's not all of them...but I'm leaning toward B. Help please?
Thank you!

B is indeed correct. If two functions are multiplicative inverses then that means that the product of the two functions equals 1.
Note that cos^(1) denotes the functional inverse of cos, so this not the same as 1/cos(x).