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6.4 Sum and Difference Formulas

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6.4 Sum and Difference Formulas. Sum and Difference Formulas for Cosines. (1) Find the exact value of. Theorem Sum and Difference Formulas for Sines. (2) Find the exact value of. Examples 3 - 7. Page 491: 13 – 21 odd. 8.

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6.4 Sum and Difference Formulas

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  1. 6.4Sum and Difference Formulas

  2. Sum and Difference Formulas for Cosines

  3. (1) Find the exact value of

  4. Theorem Sum and Difference Formulas for Sines

  5. (2)Find the exact value of

  6. Examples 3 - 7 • Page 491: 13 – 21 odd

  7. 8

  8. Theorem Sum and Difference Formulas for Tangents

  9. (9)Find the exact value of

  10. Cofunction Identities

  11. (10)Establish the identity • Cos (3/2 + ) = sin 

  12. (11) Example 10 on p. 490

  13. Assignment • Pages 491 – 492: 2, 10, 12, 18, 20, 22, 28, 30, 34, 64, and 74

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