Sum and Difference formulas for SINE and COSINE

1
Section 7.4

• Sum and Difference formulas for SINE and COSINE

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(1,0)
3
   
 
4
Theorem Sum and Difference Formulas for Cosines
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6
Find the exact value of cos(195º)
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Cofunction Identities
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Theorem Sum and Difference Formulas for Sines
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3
-1
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Find the exact value of sin(?ß)

• 1. 56/65
• 2. - 56/65
• 3. 16/65
• 4. - 16/65
• 5. 36/65
• 6. - 36/65
• 7. 13/65
• 8. - 13/65
• 9. None of these

• Given information
• Sin ? 3/5
• ? is in quadrant I
• Cos ß -12/13
• ß is in quadrant III

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What quadrant is (?ß) in given the last question?

• Quadrant I
• Quadrant II
• Quadrant III
• Quadrant IV

• Given information
• Sin ? 3/5
• ? is in quadrant I
• Cos ß -12/13
• ß is in quadrant III
• 2. - 56/65