ggg

Welcome to your ggg

ax2 + bx + c = 0.
\begin{array}{l}\int _{ }^{ }▒x^ndx=x^(n+1)/(n+1)+c\oint B\cdot ds=\mu _0\varepsilon _0\frac{\partial \Phi _E}{\partial t}+\mu _0I\end{array}

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