Question: ( f ) f ( x , y ) = t a n - 1 ( x y 2 x y ) ( g )

(f)f(x,y)=tan-1(xy2xy)
(g)f(x,y)={sinxyxyifxy01ifxy=0
( f ) f ( x , y ) = t a n - 1 ( x y 2 x y ) ( g )

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