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Published byEustace Henderson Modified over 9 years ago

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5.4 Sum and Difference Formulas In this section students will use sum and difference formulas to evaluate trigonometric functions, verify identities, and solve trigonometric equations.

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Section 5.4, Sum and Difference Formulas, pg. 368

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Example 1 Find the exact value of

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Section 5.4, Sum and Difference Formulas, pg. 368

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Example 2 Find the exact value of

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Section 5.4, Sum and Difference Formulas, pg. 368

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Example 3 Find the exact value of sin(u+v) given, where and where

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Section 5.4, Sum and Difference Formulas, pg. 368

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Example 5 Prove the cofunction identity

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Section 5.4, Sum and Difference Formulas, pg. 368

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Example 6 Simplify the expression. a.b.

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Section 5.4, Sum and Difference Formulas, pg. 368

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Example 7 Find all solutions of in the interval

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