

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


A. 
1 
B. 



C. 

D. 



Hint 


2. 
Complete the identity = ________. 


A. 
sin x 
B. 
cot x 


C. 
cos x 
D. 
tan x 


Hint 


3. 
If cos = and has its terminal side in the first quadrant, find the exact value of sin 2. 


A. 

B. 



C. 
2 
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. 
Use a halfangle identity to find the exact value of tan . 


A. 

B. 



C. 
 
D. 
 


Hint 

