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複数行にわたる数式（行列の場合）
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イコールとプラスを縦にそろえる
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<tex>
\left(
     \begin{array}{c}
	x''''\\
        y''''\\
        z''''\\
     \end{array}
\right)
&=
\left(
     \begin{array}{ccc}
	\cos \theta \cos \phi & \cos \theta\sin \phi & -\sin \theta \\
	-\sin \phi & \cos \phi & 0 \\
	\sin \theta \cos \phi & \sin \theta \sin \phi & \cos \theta \\
     \end{array}
\right)
\left(
     \begin{array}{c}
	x\\
        y\\
        z\\
     \end{array}
\right)

\\

&

+\delta \theta 

\left(
     \begin{array}{ccc}
	-\sin \theta \cos \phi & -\sin \theta \sin \phi & -\cos \theta \\
	0 & 0 & 0 \\
	\sin \theta \cos \phi & \cos \theta \sin \phi & -\sin \theta \\
     \end{array}
\right)

\left(
     \begin{array}{c}
	x\\
        y\\
        z\\
     \end{array}
\right)

\\

&+\delta \phi

\left(
     \begin{array}{ccc}
	-\cos \theta \sin \phi & \cos \theta \cos \phi & 0 \\
	-\cos \phi & -\sin \phi & 0 \\
	-\sin \theta \sin \phi & \sin \theta \cos \phi & 0 \\
     \end{array}
\right)

\left(
     \begin{array}{c}
	x\\
        y\\
        z\\
     \end{array}
\right)

</tex>

@@author: tomo@@
@@accept: sample@@