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Recently Referred Formulae

\begin{array}{rcrcr} 2x & + & 2y &=& 5 \end{array}
\left\{ \begin{array}{rcrcr} 2x & + & 5y & = & -3 \\ 3x & + & y & = & 2 \end{array} \right.
y &=& \log_e x \\ \frac{d}{dx}y &=& \frac{1}{x}
複数行にわたる数式のサンプル
y &=& \ln x \\ \frac{d}{dx}y &=& \frac{1}{x}
連立方程式のサンプル
\left\{ \begin{array}{rcrcr} 2x & + & 5y & = & 12 \\ 3x & + & y & = & 5 \end{array} \right.