# The unit circle definition of the trigonometric functions

2 videos
Learn about the ingenious way in which we define the trigonometric functions for any real number.

### Unit circle definition of trig functions

VIDEO 9:04 minutes
Sal shows how we can extend SOH CAH TOA so that we can define trig functions (sine, cosine, & tangent) for all real numbers.

### The trig functions & right triangle trig ratios

VIDEO 6:57 minutes
Sal shows how, for acute angles, the two different definitions of the trigonometric values (SOH CAH TOA and the unit circle definition) result in the same values.