Tutorial for how to evaluate for the composition of two trigonometric functions

The video tutorial covers inverse functions, focusing on the tangent of π/4 and its relation to 45-degree triangles. It explains the constraints of sine, cosine, and tangent functions, emphasizing the unit circle and coordinate points. The tutorial also explores the properties of 45-degree triangles and their significance in trigonometry, concluding with a discussion on cosine and its relationship with angles.

Describe how to find the tangent of an angle using the unit circle.

When is cosine equal to 1, and what does it represent?