Eduncle let f(x, y) = 2xy/n¢x2 + y), if (x, y) (0, 0) and f(0, 0) = 0 then ,0, 0) f,(0, 0) (c) 18. (b) f,0, 0) f0, 0) (a) f,0, 0) f,(0, 0) (d) none

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