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输入不换行公式：

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\begin{equation}\label{eq:2}u_{exact} = \sin(x) - \frac{1}{4} \sin(4x) + \frac{1}{8} \sin(8x)  - \frac{1}{16} \sin(16x) + \frac{1}{24} \sin(24x) - \frac{1}{48} \sin(48x) + \frac{1}{128} \sin(128x) - \frac{1}{256} \sin(256x)\end{equation}

输入换行公式，有编号

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\begin{align}\label{eq:2}u_{exact} & = \sin(x) - \frac{1}{4} \sin(4x) + \frac{1}{8} \sin(8x)  - \frac{1}{16} \sin(16x) + \frac{1}{24} \sin(24x) \\&- \frac{1}{48} \sin(48x) + \frac{1}{128} \sin(128x) - \frac{1}{256} \sin(256x)
\end{align}

输入换行公式，无编号

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\begin{align*}\label{eq:2}u_{exact} & = \sin(x) - \frac{1}{4} \sin(4x) + \frac{1}{8} \sin(8x)  - \frac{1}{16} \sin(16x) + \frac{1}{24} \sin(24x) \\&- \frac{1}{48} \sin(48x) + \frac{1}{128} \sin(128x) - \frac{1}{256} \sin(256x)
\end{align*}