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Let y = y ( x ) be the solution curve of the differential equation x y dx dy  (1 + xy 2 (1 + log e x)), x > 0, y

1. = 3. Then 9 ) x ( y 2 is equal to
2. ) x log 2 ( x 3 7 x 2 e 3 2  
3. 3 ) x log 2 ( x 2 x 3 e 3 2  
4. ) x log 2 ( x 2 5 x 3 e 3 2   (4) 2 ) x log 1 ( x 3 x 2 e 3 2  

Correct answer: 3 ) x log 2 ( x 2 x 3 e 3 2  

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