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Let y = y(x) be the solution of the differential equation (x + 1) y ′ – y = e 3x (x + 1) 2 , with y(0) = 3 1 . Then, the point x = – 3 4 for the curve y = y(x) is -

1. not a critical point
2. a point of local minima
3. a point of local maxima
4. a point of inflection

Correct answer: a point of local minima

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