Math eq
c
\begin{equation}
\begin{array}{l}
u=x^{2}+y^{2}+z^{2} \\
v=x y^{2}-y z^{2}+x y \\
w=? \\
\frac{\partial u}{\partial x}=2 x \\
\frac{\partial v}{\partial y}=2 x y-z^{2}+x
\end{array}
\end{equation}
\begin{equation}
x^{2}=\frac{5}{a} \times \frac{a^{2}}{5}
\end{equation}
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