Master Evaluating the double angle for Sine, Cosine and Tangent from a right triangle

The video tutorial explains how to evaluate trigonometric functions using double angle formulas. It covers the formulas for sine, cosine, and tangent, and demonstrates how to apply them using a right triangle with given side lengths. The instructor emphasizes the importance of memorizing these formulas for tests and homework, and provides step-by-step calculations for each function.

What new insight or understanding did you gain from this video?