Common Core
F-TF.B.6
2 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Trigonometry · Chapter 4 · Lesson 1
Inverse Trigonometric Functions
Going from a ratio back to an angle.
Trigonometry · Chapter 4 · Lesson 3
Composing Functions and Inverses
Sometimes the two cancel, and sometimes they do not.