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Q8. Given that z(x, y) = xy2 + In(x + 1) + 2y2, please calculate the extreme point (or saddle point) of the function. If

Q8. Given that z(x, y) = xy2 + In(x + 1) + 2y2, please calculate the extreme point (or saddle point) of the function. If there is no such point, please explain in detail. (10 points)

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