Using trig limits to evaluate the limit

The video tutorial explains the concept of tangent in trigonometry, showing how it can be expressed as a fraction of sine and cosine. The teacher demonstrates simplifying this fraction by multiplying by the reciprocal and evaluates the limit as x approaches 0. The tutorial concludes with a reminder of the unit circle and the transformation of trigonometric functions.

How does the teacher suggest transforming fractions in the context of this lesson?

What is the value of cosine at the angle 0 according to the unit circle?