Solve each of the following.

If you have troubles with any of these you probably don't have sec. 7.4 down yet. Please work on it some more.

1. cos^-1(cos(13π/12))
2. tan^-1(tan(3))
3. cos(cos^-1(2))
4. cos^-1(cos(5π/12))
5. sin^-1(sin(2))
6. sin^-1(sin(2π/7))
7. tan(tan^-1(π))
8. tan^-1(tan(-5π/8))
9. cos^-1(cos(½))
10. sin^-1(sin(6π/7))
11. cos^-1(cos(4))
12. sin(sin^-1(1))
13. tan^-1(tan(-7π/8))