Geometry

Question Analysis  
This question involves calculating the exact volume of a sphere.
The main focus is on correctly applying the formula and simplifying the expression.  

Key Concept Explanation  
The volume of a sphere is given by:    
Keeping π symbolic ensures the answer is exact, not an approximation.  

Step-by-Step Solution  
1. Substitute into the formula:  
   
2. Calculate :  
 

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