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Sum and Difference Identities

Sum and Difference Identities. T, 11.0 Students demonstrate an understanding of half-angle and double-angle formulas for sines and cosines and can use those formulas to prove and/or simplify other trigonometric identities. . Sum and Difference Identities. Objectives. Key Words:.

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Sum and Difference Identities

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  1. Sum and Difference Identities T, 11.0 Students demonstrate an understanding of half-angle and double-angle formulas for sines and cosines and can use those formulas to prove and/or simplify other trigonometric identities.

  2. Sum and Difference Identities Objectives Key Words: Difference Identity for Cosine Sum Identity for Cosine • Use the sum and difference identities for the sine, cosine, and tangent functions • Cosine Function • Sine Function • Tangent Function

  3. Pre-requisite Check What does the symbol mean? Identify the two expressions Solve: Solve:

  4. Sum and Difference Identities for the Tangent Function

  5. Example 1 Use the sum or difference identity for tangent to find the exact value of tan 345°.

  6. Examples You Try:

  7. Example 2

  8. Example You Try:

  9. Conclusions Summary Assignment Pg 442 (18,20,25,28,30,38) Complete assignment in class • Write the sum and difference identities for the tangent function as two equations.

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