Show that the second-derivative test fails

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Reference no: EM131169002

(a) Find the domain of the function f (x, y) = ln(1 + x²y).

(b) Prove that the stationary points are all the points on the y-axis.

(d) Classify the stationary points by looking directly at the sign of the value of f (x, y). Then look at the figure in the answer section.

Reference no: EM131169002

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