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The differential equation of the family of curves, x 2 = 4b(y + b), b  R, is :

1. x(y') 2 = 2yy' – x
2. x(y') 2 = x – 2yy'
3. x(y') 2 = x + 2yy'
4. xy'' = y'

Correct answer: x(y') 2 = x + 2yy'

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