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Latex matrix set is too long. How to force a line break?
\begin{multline}

\left[{\begin{array}{*{20}{c}}

{{}^B{{\bf{\tau }}_{m,x}}}\\

{{}^B{{\bf{\tau }}_{m,y}}}\\

{{}^B{{\bf{\tau }}_{m,z}}}

\end{array}}\right] =

\left[\begin{array}{ccc}

- b{s_{{\alpha _ 1}}}? & amp? { c _ { { \ alpha _ 2 } } } \ left({ b { s _ { { \ beta _ 2 } } }-a { c _ { { \ beta _ 2 } } } \ right)\ \

{ c _ { { \ alpha _ 2 } } } \ left({ b { s _ { { \ beta _ 1 } } }-a { c _ { { \ beta _ 1 } } } \ right)& amp; - b{s_{{\alpha _2}}}\\

-a { s _ { { \ alpha _ 1 } } } & amp; ? b{s_{{\alpha _2}}}

\end{array}\right。 \\

\ To the left. \begin{array}{cc}

b { s _ { { \ alpha _ 3 } } } & amp{ c _ { { \ alpha _ 4 } } } \ left({-b { s _ { { \ beta _ 4 } } }+a { c _ { { \ beta _ 4 } } } \ right)\ \

{ c _ { { \ alpha _ 3 } } } \ left({ b { s _ { { \ beta _ 2 } } }+a { c _ { { \ beta _ 2 } } } \ right)amp; b{s_{{\alpha _4}}}\\

-a { s _ { { \ alpha _ 3 } } } & amp; An {s _ {{\ alpha _ 4}} \ \

\end{array}\right]\bf{T}

\end{multline}