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Chapter 6
Trigonometric Identities and Conditional Equations

Section 6.1 deals with using basic identities to establish other identities.

• There is a list of basic trig identities in a bluish box on page 474.  Memorize these.  You will need them at your fingertips for later work.

• You will need to be able to use the basic identities to verify other (more complicated) identities.  The only way to learn to do this is to PRACTICE doing a lot of them.

Sections 6.2, 6.3 and 6.4 deal with additional identities.

• Memorize the identities listed in the bluish box on page 487.

• Memorize the double-angle and half-angle identities.

• Ask your prof if you will have to memorize the product-sum and sum-product identities.

• How can identities be used to find exact values of trig functions?

Section 6.5 deals with solving trig equations.

• How can you use algebra to solve a trig equation?

• How can you write an expression for all solutions?

• How can you use identities to solve a trig equation?

• How can you sometimes use the quadratic formula to solve a trig equation?

• How can you use a graph to solve a trig equation?