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Let y = y(x) be a solution curve of the differential equation. (1 – x 2 y 2 )dx = ydx + xdy. If the line x = 1 intersects the curve y = y(x) at y = 2 and the line x = 2 intersects the curve y = y(x) at y =  , then a value of  is

1. ) 1 e 3 ( 2 e 3 1 2 2  
2. ) 1 e 3 ( 2 e 3 1 2 2  
3. ) 1 e 3 ( 2 e 3 2 2 
4. ) 1 e 3 ( 2 e 3 2 2 

Correct answer: ) 1 e 3 ( 2 e 3 1 2 2  

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