Find all points (x, y) where 
has a possible relative maximum or minimum. Use the second-derivative test to determine, if possible, the nature of f(x, y) at each of these points.
A. (-1, 1) gives a relative maximum point
B. (1, 1) gives a relative minimum point
C. (-1, 1) gives a relative minimum point
D. Neither a relative maximum nor a relative minimum at (-1, 1)
Answer: A
Mathematics
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