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Considere a seguinte função f:\mathbb{R}^2 \rightarrow \mathbb{R} definida p...

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Considere a seguinte função  f:\mathbb{R}^2 \rightarrow \mathbb{R} f:\mathbb{R}^2 \rightarrow \mathbb{R} definida por

f(x,y)=\left\{\begin{matrix} \displaystyle \frac{5\cos(xy)x^2y^2}{\sqrt{x^2+y^2}}, & (x,y)\neq (0,0)\\ 0, & (x,y)= (0,0)\end{matrix} \right.. f(x,y)=\left\{\begin{matrix} \displaystyle \frac{5\cos(xy)x^2y^2}{\sqrt{x^2+y^2}}, & (x,y)\neq (0,0)\\ 0, & (x,y)= (0,0)\end{matrix} \right..

Mostre que ff é diferenciável em (0,0)(0,0).

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