Use cofunction identities and trig identities to find the indicated trig functions

The video tutorial explains trigonometric identities, focusing on sine, cosine, and tangent. It discusses the unit circle and how angles are represented as coordinates. The instructor demonstrates solving for the cosine of 30 degrees using known values of sine and tangent, emphasizing the use of reciprocal identities and rationalizing denominators in equations.

What is the cosine of 30 degrees?

Explain the relationship between sine, cosine, and tangent in the context of the unit circle.

What does the Pythagorean identity state about sine and cosine?

How can you derive the cosine of an angle using sine and tangent?

Describe the process of rationalizing the denominator when calculating cosine.