4.1

Definitions and how to compute arrccos, arcsin, and arctan was covered in Section 1.5. 

The first two videos are from 1.5 if you need a review of the basics, including definitions.

Inverse Trigonometric Functions 1: http://youtu.be/wSwWR36QLd8

Intro to Inverse Trig Functions. Definition of inverse trigonometric functions and examples are in Part 2.

Inverse Trigonometric Functions 2: http://youtu.be/f8YFcH1-Ezg

Defines the Inverse Trig Functions for Sin, Cos, and Tan. Shows how to evaluate the inverse trigonometric functions where the answer is a special angle.

Inverse Trigonometric Functions 3: http://youtu.be/YbeaTJYqZ8U

Inverse Trigonometric Functions 4: http://youtu.be/oHzjrHsXmow

Inverse Trigonometric Functions 5: http://youtu.be/yab-W7u0l6w