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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 42

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 maximum at


A) (1,3) ( 1,3 )
B) (1,3) ( - 1 , - 3 )
C) (1,3) ( 1 , - 3 )
D) (1,3) ( - 1,3 )
E) (1,13) \left( - 1 , \frac { 1 } { 3 } \right)

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