1. Find all critical points for the function f(x, y) = x3 - y3 + 33xy and classify each as a relative maximum, a relative minimum, or a saddle point.
(A) fhas a saddle point at (11,-11) and a relative minimum at (0,0).
(B) fhas a saddle point at (0,0) and a relative maximum at (11,-11).
(C) fhas a saddle point at (0,0) and a relative minimum at (11,-11).
(D) fhas a saddle point at (11,-11) and a relative maximum at (0,0).
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統計: A(0), B(2), C(0), D(0), E(0) #3157429
統計: A(0), B(2), C(0), D(0), E(0) #3157429