\[\lim _{ \left( x,y \right) \rightarrow \left( 1,1 \right) }{ \frac { { x }^{ 2 }y-{ y }^{ 2 }x }{ \sqrt { x } -\sqrt { y } } \quad =\quad ? } \]

**Note:** Enter 999 if the limit does not exist or is not defined.

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