Verifying trigonometric identities by converting to sines and cosines

What is the first step to take when working on a complicated side of a trigonometric expression?

What should you do when you encounter tangent and cotangent in an expression?

Explain the importance of converting trigonometric functions to sines and cosines.

How can you combine fractions with unlike denominators in trigonometric expressions?

What does the Pythagorean identity state regarding sine and cosine?