If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.
If you're behind a web filter, please make sure that the domains
*.kastatic.org and *.kasandbox.org are unblocked.
Inverse trig functions
Someone has taken the sine of an angle and got 0.85671 and they won't tell you what the angle is!!! You must know it! But how?!!!
Inverse trig functions are here to save your day (they often go under the aliases arcsin, arccos, and arctan).
Introduction to the inverse trig function arcsin
Understanding the inverse cosine or arccos function
Understanding the arctan or inverse tangent function.
Example using calculator to evaluate inverse tangent function
Sal is given the graph of a trigonometric function, and he discusses ways in which he can change the function to make it invertible.