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7.3 Sum and Difference Identities

7.3 Sum and Difference Identities. Objective : Use the sum and difference identities for the sine, cosine, and tangent functions. Use the sum or difference identity for cosine to find the exact value of cos 735°.

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7.3 Sum and Difference Identities

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  1. 7.3Sum and Difference Identities Objective: Use the sum and difference identities for the sine, cosine, and tangent functions.

  2. Use the sum or difference identity for cosine to find the exact value of cos 735°.

  3. Use the sum or difference identity for cosine to find the exact value of sin 165°.

  4. Find the value of sin (x – y) if sin x = 0 < x < if sin y = 0 < y<

  5. Find the value of tan (x + y) if sin x = 270° < x < 360° if cos y = 270° < y< 360° tan (x + y) = tan (x + y) =

  6. Verify the csc = -sec A

  7. Assignment 7.3 Practice Worksheet #1-8, 10-11 7.3 pg442-443 #14, 18, 22, 26, 27

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