Chapter 5: Verifying Trig Identities: Reciprocal, Quotient, Pythagorean, Co-function, and Even/Odd

Fundamental trigonometric  identities can be used to simplify trigonometric expressions. 
After studying and learning the basic definition, properties, graphs, and applications of the individual trigonometric functions, you can learn to use fundamental identities to:
1. Evaluate trigonometric functions.
2. Simplify trigonometric expressions.
3. Develop additional trigonometric identities.
4. Solve trigonometric equations.

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