1. Sum and Difference Formulas...using the sum and difference formula to solve trigonometric equation

2. Sum and Difference Formulas

3. NOW it’s your turn find the exact values of sin 75˚

4. NOW it’s your turn find the exact values of sin 7 ∏ 12

5. Find the exact value of sin 42° cos 12° - cos 42° sin 12° 1/2

6. exercise: find the exact value of each expression. (a) cos (120° + 45°) (b) sin (135° - 30°) (c) cos 120° + cos 45° (d) sin 135° - cos 30°

7. Find the exact value of cos 255º √ 6 4 √ 2- ( 300º - 45º ) cos 300° cos 45° + sin 300° sin 45°

8. Find the exact value of sin (30º + 45º)

9. Find the exact value of sin 32° cos 13° + cos 32° sin 13° √ 2 2

10. Find the exact value of sin 165º √ 6 - 4 √ 2

11. Find the exact value of cos 195º √ 6 - 4 √ 2 -