

1. 
If sin = and has its terminal side in the first quadrant, find the exact value of cos 2. 


A. 

B. 



C. 

D. 
1 


Hint 


2. 
Use a halfangle identity to find the exact value of sin 67.5°. 


A. 

B. 



C. 

D. 



Hint 


3. 
Find sin 2 if sin = and 0° < < 90°. 


A. 

B. 



C. 

D. 



Hint 


4. 
If cos = and has its terminal side in the first quadrant, find the exact value of cos . 


A. 

B. 



C. 
 
D. 
 


Hint 


5. 
Find the value of tan 2 if sin = and 0 < < . 


A. 

B. 



C. 
 
D. 



Hint 

