Practice Page
Directions: Solve using sum, difference, double and half angle formuals. Unless otherwise stated, an exact answer is expected.

1.
formula72

 

 

2.
formula48

 

 

3.
formula49

 

 

4.
formula50
 

 

 

5.
formula51

 

 

6.
Find the exact value of cos105º.

 

 

7.
Is the following problem solved correctly?
If not, correct the error(s).
Find sin(105º).

Solution(?):
formula53

 

 

8.
formula54

 


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