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答案1
如果您打算构建显示函数变化的表格,您可以查看该variations
包,它会产生以下输出:
使用代码
\documentclass{minimal}
\usepackage{variations}
\begin{document}
\def\isq{\frac{1}{\displaystyle\sqrt{2}}}
\begin{minipage}{\linewidth}\centering
\begin{variations}
x & \mI & &-\isq & & \isq & & \pI \\
\filet
f' & \ga + & 0 & - & 0 & \dr+ \\
\filet
\m{f} & ~ & \c & \h{~} & \d & ~ & \c \\
\end{variations}
\end{minipage}
\end{document}