Toss Up - Math - Multiple Choice

Which of the following pairs of angles are complementary?
W) `tan^-1(1)` and `sin^-1(sqrt(3)/2)`
X) `cos^-1(2/3)` and `cos^-1(-2/3)`
Y) `sin^-1(1/3)` and `cos^-1(1/3)`
Z) `tan^-1(1/5)` and `cos^-1(4/5)`