Simplify the following and express each answer as an exact value.

 

1. 
   
   
   
   
   
   
   
2. 
   
   
   
   
   
   
   
3. 
   
   
   
   
   
   
   
4. 
   
   
   
   
   
   
   
5. 

 

 

 

 

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