Error while equation splitting with align environment

Question

I am splitting an equation using the following command:

   \documentclass[12pt,letterpaper]{report}
    \usepackage[cmex10]{amsmath}
    \begin{document}
    \begin{align}
    \delta \dot A &=-\left [ -\delta b_z-\omega^e\cos \varphi\delta\varphi-\frac{v_e\sec^2\varphi\delta\varphi}{R_N+h}-\frac{\tan\varphi\delta v_e}{R_N+h} \nonumber\\
    &+\frac{v_e\tan\varphi\delta h}{(R_N+h)^2} \right ]
    \end{align}
    \end{document}

However it gives me an error that I have extra } etc. I am using similar thing elsewhere with no problem at all. Can somebody please tell me what is going on and how can i fix it. Thanks

related: How to make \left, \right pairs of delimiter work over multiple lines? — barbara beeton, Mar 06 '15 at 16:00

score 2 · Accepted Answer · answered Mar 06 '15 at 15:06

2

You can't split \left and \right across lines. You need to size the brackets yourself using \big, \Big, etc.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
\delta \dot A &=-\bigg[ -\delta b_z-\omega^e\cos \varphi\delta\varphi    
                        -\frac{v_e\sec^2\varphi\delta\varphi}{R_N+h}
                        -\frac{\tan\varphi\delta v_e}{R_N+h}\nonumber\\  
& +\frac{v_e\tan\varphi\delta h}{(R_N+h)^2} \bigg] 
\end{align}
\end{document}

answered Mar 06 '15 at 15:06

Ian Thompson

43,767

You may want to insert \qquad after the & symbol in the second row of the equation. – Mico Mar 06 '15 at 15:31
Or use {} & = on the first row – daleif Mar 06 '15 at 15:54
@daleif -- huh? with ordinary align, that doesn't make any difference at all. are you thinking of something from mathtools? – barbara beeton Mar 06 '15 at 15:58
@barbarabeeton sorry, should have been = {} & – daleif Mar 06 '15 at 16:19

Error while equation splitting with align environment

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