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# 6.5.2 half angle formulas

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### 6.5.2 half angle formulas

1. 1. Use Half-Angle Formulas to find Exact Values 6.5 Half-Angle Formulas
2. 2. Sine Half-Angle Formula 1 cos sin 2 2        
3. 3. Find the exact value 1 3 tan , 2 2       sin 2      
4. 4. Find the exact value 3 3 sin , 2 3 2        sin 2      
5. 5. Cosine Half-Angle Formula 1 cos cos 2 2        
6. 6. Find the exact value 1 tan , cos 0 2    cos 2      
7. 7. Find the exact value 3 sin , 3 2       cos 2      
8. 8. Use half-angle formula to find the exact value cos22.5
9. 9. Tangent Half-Angle 1 cos tan 2 1 cos          
10. 10. Additional formulas 1 cos tan 2 1 cos           1 cos tan 2 sin          sin tan 2 1 cos         
11. 11. Use half-angle formula to find the exact value 9 tan 8 
12. 12. Assignment p. 491 # 7 - 11 odd (c,d), 19 - 23 odd, 48