 is in quadrant I, so
 is in quadrant I, so  .
.
 is in quadrant II, so
 is in quadrant II, so  .
.
Recall that for any angle  ,
,

Then with the conditions determined above, we get

and

Now recall the compound angle formulas:




as well as the definition of tangent:

Then
1. 
2. 
3. 
4. 
5. 
6. 
7. A bit more work required here. Recall the half-angle identities:



Because  is in quadrant II, we know that
 is in quadrant II, we know that  is in quadrant I. Specifically, we know
 is in quadrant I. Specifically, we know  , so
, so  . In this quadrant, we have
. In this quadrant, we have  , so
, so

8. 
 
        
             
        
        
        
Answer:
(-2,1),(-1,2),(-3,5/3)
Step-by-step explanation:
 
        
             
        
        
        
Answer:
168
Step-by-step explanation:
Multiply 21 by 8 so
21 × 8 = 168
 
        
             
        
        
        
0.300+0.030+0.004 hope this helps
        
             
        
        
        
Answer:  The number of yes votes = 1918.
Step-by-step explanation:
Given : The ratio of yes to no votes = 2:3
Then the ratio of yes to total votes = 
Total votes = 4795
Number of yes votes  =  (ratio of yes to total votes) x (Total votes )
= 
Hence, the number of yes votes = 1918.