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Classifying critical points


The scalar field f, left parenthesis, x, comma, y, right parenthesis, equals, minus, left parenthesis, x, plus, 1, right parenthesis, squared, minus, left parenthesis, y, minus, 1, right parenthesis, squared has a critical point at left parenthesis, minus, 1, comma, 1, right parenthesis.
How does the second partial derivative test classify this critical point?
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