latex 括号
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数学
正文
f(x)=\left\{ \begin{aligned} x &=&\cos(t) \\ y &=&\sin(t) \end{aligned} \right.
= $ f(x)=\left\{ \begin{aligned} x &=&\cos(t) \\ y &=&\sin(t) \end{aligned} \right. $
（1）&表示对齐点
（2）aligned表示不使用公式编号
（3）\\用于分行
\left( \frac{a}{b} \right) = $\left( \frac{a}{b} \right)$
\left[ \frac{a}{b} \right] = $\left[ \frac{a}{b} \right]$
\left\{ \frac{a}{b} \right\}=$\left\{ \frac{a}{b} \right\}$
\left \langle \frac{a}{b} \right \rangle=$ \left \langle \frac{a}{b} \right \rangle$
\left| \frac{a}{b} \right|=$ \left| \frac{a}{b} \right|$
\left \| \frac{a}{b} \right \|=$\left \| \frac{a}{b} \right \|$
\left \lfloor \frac{a}{b} \right \rfloor=$\left \lfloor \frac{a}{b} \right \rfloor$
\left \lceil \frac{c}{d} \right \rceil=$\left \lceil \frac{c}{d} \right \rceil$
\left / \frac{a}{b} \right \backslash=$\left / \frac{a}{b} \right \backslash$
\left \{ \frac{a}{b} \right .=$\left \{ \frac{a}{b} \right .$
\left . \frac{a}{b} \right \} = $\left . \frac{a}{b} \right \}$
可以使用\big, \Big, \bigg, \Bigg控制括号的大小，比如代码
\Bigg ( \bigg [ \Big \{ \big \langle \left | \| \frac{a}{b} \| \right | \big \rangle \Big \} \bigg ] \Bigg )=$\Bigg ( \bigg [ \Big \{ \big \langle \left | \| \frac{a}{b} \| \right | \big \rangle \Big \} \bigg ] \Bigg )$
矩阵的输入(在编辑时最好在html源码级，否则可能因为隐藏的标签导制不可用)
\begin{equation}
\left [
\begin{array}{cccc} #代表四行
a_{11}& a_{12} &\cdots & a_{1n}\\
a_{21}& a_{22} &\cdots& a_{2n}\\
\vdots & \vdots & \ddots & \vdots \\
a_{n1}& a_{n2} &\cdots &a_{nn}
\end{array}
\right]
\end{equation}\begin{equation}
\left [
\begin{array}{cccc}
a_{11}& a_{12} &\cdots & a_{1n}\\
a_{21}& a_{22} &\cdots& a_{2n}\\
\vdots & \vdots & \ddots & \vdots \\
a_{n1}& a_{n2} &\cdots &a_{nn}
\end{array}
\right]
\end{equation}