这是我写的一小段代码
> \begin{equation}
\begin{aligned}
\bm{A}_{-k}=\left(&\underbrace{0\quad\cdots\quad 0}_{k...
这是我写的一小段代码
> \begin{equation}
\begin{aligned}
\bm{A}_{-k}=\left(&\underbrace{0\quad\cdots\quad 0}_{k-1}\quad k(1-\alpha^2)\alpha^k\quad-(k+1)(1-\alpha^2)\alpha^k\quad\underbrace{0\quad\cdots\quad 0}_{N-1}\right.
\\
&\left.\alpha^{-k}-\alpha^{k}\quad\alpha^{k+2}-\alpha^{-k}\quad\underbrace{0\quad\cdots\quad 0}_{N-k}\right)^{\rm T}
\end{aligned}
\label{eqa:8}
\end{equation}
总是报错
Extra }, or forgotten \right. \bm{A}_{-k}=\left(&
Missing \right. inserted. \bm{A}_{-k}=\left(&
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