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$\sqrt{3 x - 1} + (1 + x)^{2}$

测试脚注 ^[1]

\begin{matrix} \nabla \times \vec{B} -, \frac{1}{c}, \frac{\partial \vec{E}}{\partial t} & \= \frac{4 π}{c} \vec{j} \nabla \cdot \vec{E} & = 4 π ρ \\ \nabla \times \vec{E}, +, \frac{1}{c}, \frac{\partial \vec{B}}{\partial t} & = \vec{0} \\ \nabla \cdot \vec{B} & = 0 \end{matrix}

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