<正文>替换为你想要输入的代码。996533295的QQ群中使用这段代码进行回复即可。latex/latex <正文>
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latex\boxed{ \int\limits_{-\infty}^{\infty} e^{-x^2} \, dx = \sqrt{\pi} }
latex\gamma \overset{\text{def}}{=} \lim\limits_{n \to \infty} \left( \sum\limits_{k=1}^n {1 \over k} - \ln n \right) \approx 0.577
latex\begin{align*} y &= x^4 + 4\\ &= (x^2+2)^2 - 4x^2\\ &\leqslant (x^2+2)^2 \end{align*}
latexA_{m,n} = \begin{pmatrix} a_{1,1} & a_{1,2} & \cdots & a_{1,n} \\ a_{2,1} & a_{2,2} & \cdots & a_{2,n} \\ \vdots & \vdots & \ddots & \vdots \\ a_{m,1} & a_{m,2} & \cdots & a_{m,n} \end{pmatrix}
latexe = 2 + \cfrac{1}{ 1 + \cfrac{1}{ 2 + \cfrac{2}{ 3 + \cfrac{3}{ 4 + \cfrac{4}{\ldots} }}}}
latex\begin{picture}(76,20) \put(0,0){$A$} \put(69,0){$B$} \put(14,3){\line(1,0){50}} \put(39,3){\vector(0,1){15}} \put(14,3){\circle*{2}} \put(64,3){\circle*{2}} \end{picture}
latex\xymatrix{ A \ar[r]^f \ar[d]_g & B \ar[d]^{g'} \\ D \ar[r]_{f'} & C }
latex\begin{tikzpicture}\small \def\r{1.8} \coordinate[label=$A$] (A) at (0.5*\r,0.8*\r); \coordinate[label=below:$B$] (B) at (-\r,0); \coordinate[label=below:$C$] (C) at (\r,0); \draw[thin] (A) -- node[above] {$c$} node[pos=0.03,below,inner sep=4] {$\alpha$} (B) -- (C) -- node[right] {$b$} (A); \end{tikzpicture}
latex\begin{tikzpicture}[domain=0:2] \draw[very thin] (-0.1,-0.1) grid (2.1,2.1); \draw[->] (-0.2,0)--(2.2,0) node[right] {$x$}; \draw[->] (0,-0.2)--(0,2.2) node[above] {$y$}; \draw plot (\x,{sin(\x r)}) node[right] {$y=\sin x$}; \draw[color=blue] plot (\x,\x) node[right] {$y=x$}; \end{tikzpicture}