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

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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{5xy^2}{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{5xy^2}{x^2+y^2}, & (x,y)\neq (0,0)\\ 0, & (x,y)= (0,0)\end{matrix} \right..

A derivada direcional de ff na direção do vetor \displaystyle \vec{u}=\left(\frac{2\sqrt{5}}{5},\frac{\sqrt{5}}{5}\right)\displaystyle \vec{u}=\left(\frac{2\sqrt{5}}{5},\frac{\sqrt{5}}{5}\right)no ponto (0,0)(0,0) é

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