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Classifying critical points

Problem

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?
Choose 1 answer:
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