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Let f(x,y) = 0 if xy ne 0 and f (x,y) =...

Let f(x,y) = 0 if `xy ne 0 and f (x,y)` = 1 if xy = 0 .
(i) Calculate : `(delf)/(delx)(0,0),(delf)/(dely)(0,0)`
(ii) Show that f is not continuous at (0,0)

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