November 7, 2012 Verifying Trig Identities Homework questions HW 5.2: Pg. 387 #4-36, multiples of 4.

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November 7, 2012 Verifying Trig Identities Homework questions HW 5.2: Pg. 387 #4-36, multiples of 4

Use factoring to simplify Example 3: common factor difference of squares a)sin 2 x csc 2 x – sin 2 xb) sec 4 x – tan 4 x Use these strategies for HW #45-53 odd

Lesson 5.2 Verifying Trig Identities Goal: Get one side of the equation equal to the other. Strategy: - Work on one side to make it equal to the other side.

Great first step strategies! 1.Start with the side that seems more complicated: (fractions, common multiples, etc.) 2.Combine fractions – get a common denominator. 3.Substitute an identity before multiplying. 4.Convert everything to sine and cosine. 5.Write as separate fractions. 6.Work with both sides separately. (Do not add/subtract/mult/divide to both sides. 7.Factor

Strategy 1. Start with the side that seems more complicated: (fractions, common multiples, etc.

Strategy 2. Combine fractions – get a common denominator.

Strategy 3. Multiplying (tan 2 x + 1)(cos 2 x – 1) = -tan 2 x

Strategy 4. Converting to Sines and Cosines