Master Writing an expression as one single angle using double angle formulas

The video tutorial explains how to find the exact values of expressions using double angle formulas for sine, cosine, and tangent. It provides examples with specific angles, demonstrating how to substitute and evaluate these expressions using the unit circle. The tutorial also covers different forms of the cosine double angle formula and discusses the use of calculators for approximate values when necessary.

What is the formula for tangent of a double angle?

How do you evaluate the tangent of 2π/5?

Explain how to rewrite an expression using the sum and difference formula.