Split equations inside the align environment

You can use split inside align:

\documentclass[11pt]{book}
\usepackage{amsmath,amsfonts,amssymb,amsthm, bm}

\begin{document}

\begin{align}
\begin{split}
  \dot{v}     & = \dfrac{1}{m}[T\cos\beta\cos(\alpha+\epsilon)-D]-g\sin\gamma \\
              &\qquad +\dot{w}_{x} \cos\gamma\cos\chi+\dot{w}_{y}\cos\gamma\sin\chi
\end{split}
\\[2ex]
\begin{split}
\dot{\gamma}  & = \dfrac{1}{m}[(Y-T\sin\beta\cos(\alpha+\epsilon))\sin\mu \\
              &\qquad + (T\sin(\alpha +\epsilon)+L)\cos\mu] - \dfrac{g}{v}\cos\gamma \\
              &\qquad +\dfrac{1}{v}[\dot{w}_{x}\sin\gamma\cos\chi + \dot{w}_{y}\sin\gamma\sin\chi]
\end{split}
\\[2ex]
\begin{split}
\dot{\chi}    & = \dfrac{1}{mv\cos\gamma}[(L+T\sin(\alpha+\epsilon) )\sin\mu \\
              &\qquad + (T\sin\beta \cos(\alpha  + \epsilon) - Y)\cos\mu] \\
              &\qquad + \dfrac{1}{v\cos\gamma}[\dot{w}_{x}\sin\chi-\dot{w}_{y}\cos\chi]
\end{split}
\end{align}

\end{document} 

enter image description here


Choose manually some suitable points at which the equations can break and add the \notag or \nonumber command to remove the equation label at that line.

\documentclass[11pt]{book}
\usepackage{amsmath,amsfonts,amssymb,amsthm, bm}

\begin{document}

\begin{align}
\dot{v}        ={} &\dfrac{1}{m}[T\cos\beta\cos(\alpha+\epsilon)-D]-g\sin\gamma +\dot{w}_{x} \cos\gamma\cos\chi+\dot{w}_{y}\cos\gamma\sin\chi \\[2pt]
\dot{\gamma}   ={} &\dfrac{1}{m}[(Y-T\sin\beta\cos(\alpha+\epsilon))\sin\mu + (T\sin(\alpha +\epsilon)+L)\cos\mu] - \dfrac{g}{v}\cos\gamma \notag\\
                   &{}+\dfrac{1}{v}[\dot{w}_{x}\sin\gamma\cos\chi+ \dot{w}_{y}\sin\gamma\sin\chi] \\[2pt]
\dot{\chi}     ={} &\dfrac{1}{mv\cos\gamma}[(L+T\sin(\alpha+\epsilon) )\sin\mu + (T\sin\beta \cos(\alpha  + \epsilon) - Y)\cos\mu] \notag\\ 
                   &{}+\dfrac{1}{v\cos\gamma}[\dot{w}_{x}\sin\chi-\dot{w}_{y}\cos\chi] 
\end{align}

\end{document}

enter image description here


You can keep using the align environment. At suitable locations, insert \notag \\ &\qquad directives to (a) introduce line breaks and (b) provide an alignment anchor for the remaining stub.

enter image description here

\documentclass[11pt]{book}
\usepackage{amsmath}

\begin{document}
\begin{align}
\dot{v}       
&= \frac{1}{m}\bigl[T\cos\beta\cos(\alpha+\epsilon)-D\bigr]-g\sin\gamma \notag\\
&\qquad +\dot{w}_x \cos\gamma\cos\chi+\dot{w}_y\cos\gamma\sin\chi \\[2pt]
\dot{\gamma} 
&= \frac{1}{m}\bigl[(Y-T\sin\beta\cos(\alpha+\epsilon))\sin\mu + (T\sin(\alpha +\epsilon)+L)\cos\mu\bigr]\notag\\
&\qquad -\frac{g}{v}\cos\gamma +\frac{1}{v}(\dot{w}_x\sin\gamma\cos\chi + \dot{w}_y\sin\gamma\sin\chi) \\[2pt]
\dot{\chi}    
&= \frac{1}{mv\cos\gamma}\bigl[(L+T\sin(\alpha+\epsilon) )\sin\mu + (T\sin\beta \cos(\alpha  + \epsilon) - Y)\cos\mu\bigr] \notag\\
&\qquad +\frac{1}{v\cos\gamma}(\dot{w}_x\sin\chi-\dot{w}_y\cos\chi)
\end{align}

\end{document} 

Tags:

Split