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Let  be the area of the region  ( x , y )  R : x 2 + y 2  21, y 2  4 x , x  1 } . Then            7 2 sin 21 2 1 1 is equal to

1. 3 4 3 
2. 3 1 3 2 
3. 3 2 3 
4. 3 2 3 2 

Correct answer: 3 4 3 

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