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This question already has an answer here:

How do we split long equation in which a command \left[ and \right] is used? My equation is as follow

\begin{align}
\begin{split}
z &=-2Re\left[B^\ast\left(\frac{1}{2}\sum_{k=0}^{N}\alpha_k\zeta^{1-k}\left(1-is_1\right)+\alpha_k\frac{1}{\zeta^{1-k}}\left(1+is_1\right)+\beta_k\zeta^{1-k}\left(i+s_1\right)+\beta_k\frac{1}{\zeta^{1-k}}\left(s_1-i\right)\right)\\
&+\left(B^{\prime\ast}+iC^{\prime\ast}\right)\left(\frac{1}{2}\sum_{k=0}^{N}\alpha_k\zeta^{1-k}\left(1-is_2\right)+\alpha_k\frac{1}{\zeta^{1-k}}\left(1+is_2\right)+\beta_k\zeta^{1-k}\left(i+s_2\right)+\beta_k\frac{1}{\zeta^{1-k}}\left(s_2-i\right)\right)\right]
\end{split}
\end{align}

LaTeX complains because the \left[ and \right] command are now separated by the \\. I am also using split command, unlike other identical post.

I am using \usepackage{amsmath}

I use \left[ and \right] because I must stretch the bracket; unless there is another way to do it. Could anyone help me, please?

marked as duplicate by David Carlisle equations Jun 23 '18 at 19:47

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • you can use \bigl( ..\\ \bigr) – David Carlisle Jun 23 '18 at 19:21
  • Welcome to TeX SX! Is there any reason why you have a split environment nested in an align? – Bernard Jun 23 '18 at 19:26
  • @DavidCarlisle thanks. It is not working as expected. The bracket is not stretched. – BeeTiau Jun 23 '18 at 19:36
  • @Bernard because I still have another equation in the same line. The one I showed above is just an example. – BeeTiau Jun 23 '18 at 19:37
  • \bigr is a fixed size use \Biggr or whatever size you need. – David Carlisle Jun 23 '18 at 19:42
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Answer provided by @David Carlisle is as follow.

\bigr is a fixed size use \Biggr or whatever size you need. – David Carlisle 2 mins ago

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