October 2018 1 20 Report

Dana jest funkcja:

\left \{ {{(\frac{xy^2}{x^2+y^2}) \ dla\ (x,y)\ \neq (0,0)} \atop {0 \ dla \ (x,y) =(0,0)}} \right.

Wykaż że:

f_{xy} \neq f_{yx}


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