March 12, 2012 At the end of today, you will be able to use the double and half angle formulas to evaluate trig identities. Warm-up: Use the sum identities.

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Ch 5.5: Multiple-Angle and Product-to-Sum Formulas

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March 12, 2012 At the end of today, you will be able to use the double and half angle formulas to evaluate trig identities. Warm-up: Use the sum identities to find the sine and cosine of if. HW 5.5: Pg. 415 #1-7odd, 23, 25, 35-39odd, 49 If you will not be here, Thursday, finish Final Review Ch 1, 2, 3 and be ready to ask questions next class. Quiz Tuesday!

Double and Half Angle Identities Double Angle IdentitiesHalf Angle Identities

Example 1: Evaluating If sinθ = 3/5, Find: sin2θ cos2θ sin(θ/2) cos(θ/2) 1. Use right triangle trig: θ Use the formulas to find the value for each.

Classwork Verifying Identities

Example 3: Solving a Multiple-Angle Equation Solve: 2cos x + sin 2x = 0