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Let f(x,y)=x3+y3+3y23x9y+2f ( x , y ) = x ^ { 3 } + y ^ { 3 } + 3 y ^ { 2 } - 3 x - 9 y + 2

Question 22

Multiple Choice

Let f(x,y) =x3+y3+3y23x9y+2f ( x , y ) = x ^ { 3 } + y ^ { 3 } + 3 y ^ { 2 } - 3 x - 9 y + 2 . Then f has a relative minimum at


A) (1,1) ( 1,1 )
B) (1,1) ( - 1,1 )
C) (1,1) ( 1 , - 1 )
D) (1,1) ( - 1 , - 1 )
E) (1,12) \left( 1 , \frac { 1 } { 2 } \right)

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