How to determine the function and angle when given an expression

The video tutorial focuses on memorizing and understanding trigonometric formulas, specifically sine and cosine. The instructor shares personal experiences with memorization and emphasizes the importance of recognizing differences between sine and cosine formulas. The tutorial also covers the application of these formulas in solving problems, using examples to illustrate the concepts.

Explain the relationship between tangent and the sine and cosine functions as mentioned in the text.

What example does the teacher provide to illustrate the sine of two angles?