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The Domain of the Function f(x,y)=2xyx2+y2f ( x , y ) = \frac { 2 x y } { x ^ { 2 } + y ^ { 2 } }

Question 19

Multiple Choice

The domain of the function f(x,y) =2xyx2+y2f ( x , y ) = \frac { 2 x y } { x ^ { 2 } + y ^ { 2 } } is


A) {(x,y) :xy}\{ ( x , y ) : x \neq - y \}
B) {(x,y) :xy}\{ ( x , y ) : x \neq y \}
C) {(x,y) :(x,y) (0,0) }\{ ( x , y ) : ( x , y ) \neq ( 0,0 ) \}
D) {(x,y) :x0}\{ ( x , y ) : x \neq 0 \}
E) {(x,y) :y0}\{ ( x , y ) : y \neq 0 \}

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