## Finding the other sum and difference formulas.docx - Section 3: Finding the other sum and difference formulas

Finding the other sum and difference formulas.docx

# Sum and Difference Day 1 of 2

Unit 9: Trigonometric Identities
Lesson 9 of 14

## Big Idea: After analyzing a proof for the sum of angles sine formula, students work to produce the other sum and difference formulas.

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Standards:
Subject(s):
Math, Trigonometric identities, sum and difference formulas
70 minutes

### Katharine Sparks

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