Find values of x and y such that both fx(x, y) = 0 and fy(x, y) = 0.f(x,y) = x3 + y3 - 9xy
A. x = 1, y = 1
B. x = 0, y = 0
C. x = 3, y = 3
D. x = -3, y = -3
Answer: C
Mathematics
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