5.4 Sum and Difference Formulas

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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(uv) 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