LaTeX数学公式测试

\[% \f is defined as #1f(#2) using the macro \relax{x} = \int_{-\infty}^\infty \hat\xi\,e^{2 \pi i \xi x} \,d\xi\] \[\begin{CD} A @>a>> B \\ @VbVV @AAcA \\ C @= D \end{CD}\] \[\begin{equation} \begin{split} a &=b+c\\ &=e+f \end{split} \end{equation}\] \[\begin{equation} x = a_0 + \cfrac{1}{a_1 + \cfrac{1}{a_2 + \cfrac{1}{a_3 + \cfrac{1}{a_4} } } } \end{equation}\] \[\sin \alpha + \sin \beta =2 \sin \frac{\alpha + \beta}{2}\cos \frac{\alpha - \beta}{2}\]