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LaTeX 表格和数学模式，平方根符号与顶部边缘之间的垂直距离不足

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LaTeX 表格和数学模式，平方根符号与顶部边缘之间的垂直距离不足

表格中的平方根符号有问题：参见注释部分

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{indentfirst}
\usepackage[left=1.2in,right=1.2in,top=1in,bottom=1in]{geometry}
\usepackage[fleqn]{amsmath}
\usepackage{amssymb}
\usepackage{enumitem}
\usepackage{array}
\usepackage{booktabs}
\usepackage{xcolor}
\newcommand{\ra}[1]{\renewcommand{\arraystretch}{#1}}
\newcolumntype{C}{>{$\displaystyle}c<{$}}

%MAY HAVE PROBLEM COMPILING EXCEPT OVERLEAF \titleformat{\section} 
{\normalfont\huge\bfseries}{\makebox[45pt][l]{\thesection}}{0pt}{} 
%MAY HAVE PROBLEM COMPILING EXCEPT OVERLEAF \titleformat{\subsection} 
{\normalfont\large\bfseries}{\makebox[45pt][l]{\thesubsection}}{0pt}{}

%MAY HAVE PROBLEM COMPILING EXCEPT OVERLEAF\setlength{\droptitle}{-4em}

\setlength{\parindent}{45pt}

\title{\Huge{\textbf{Mathematics Directory}}}
\author{\Large{Zhiyuan Liu}}
\date{15 June 2022}

\begin{document}

\maketitle

\section{Trigonometry}
\subsection{Exact Values}

\begin{center}
\renewcommand\arraystretch{1.9}
    \begin{tabular}{|c|c|c|c|}
    \hline

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  HERE  %%%%%%%%%%%%%%%%%%%%%%%

    $\theta$ (radians) & \multicolumn{1}{c|}{$\sin\theta$} & \multicolumn{1}{c|}{$\cos\theta$} & $\tan\theta$ \\
    \hline

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  UP  %%%%%%%  THERE  %%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    $0$                         & $0$     & $1$     & $0$ \\%0deg
    \hline
    $\dfrac{\pi}{12\mathstrut}$ & $\dfrac{\sqrt{2}\left(\sqrt{3}-1\right)\mathstrut}{4}$     & $ $     & $ $ \\%15deg
    \hline
    $\dfrac{\pi}{10\mathstrut}$ & $ $     & $ $     & $ $ \\%18deg
    \hline
    $\dfrac{\pi}{6\mathstrut}$ & $ $     & $ $     & $ $ \\%30deg
    \hline
    $\dfrac{\pi}{5\mathstrut}$ & $ $     & $ $     & $ $ \\%36deg
    \hline
    $\dfrac{\pi}{4\mathstrut}$ & $ $     & $ $     & $ $ \\%45deg
    \hline
    $\dfrac{\pi}{3\mathstrut}$ & $ $     & $ $     & $ $ \\%60deg
    \hline
    $\dfrac{2\pi}{5\mathstrut}$ & $ $     & $ $     & $ $ \\%72deg
    \hline
    $\dfrac{\pi}{2\mathstrut}$ & $1$     & $0$     & undefined \\%90deg
    \hline
    \end{tabular}
\label{tab:addlabel}
\end{center}
\end{document}

结果如下所示：ONLY LOOK AT \sin\left(\dfrac{\pi}{12}\right) 仅查看 \sin\left(\dfrac{\pi}{12}\right)

我的问题是：

如何增加平方根符号和表格的 \hline 之间的空间？

并保持分数底部与表格底线之间的距离相同。

我是 \LaTeX{} 的新手，所以如果代码看起来不太好，我很抱歉。

答案1

您的代码表明您已经熟悉了\mathstrut——太棒了！这里有一个建议，可以使其使用更加有效：不要放置\mathstrut 旁边一些项目，就像你在

\dfrac{\pi}{12\mathstrut}

和

\dfrac{\sqrt{2}\left(\sqrt{3}-1\right)\mathstrut}{4}

将其放置在相对于所选项目的下标和上标位置，例如，

    \dfrac{\pi}{12_{\mathstrut}}

和

\dfrac{{\sqrt{2}}^{\mathstrut} \,(\sqrt{3}-1)}{4}

请注意，我（a）删除了和\left大小\right调整指令，并且（b）将其放置\mathstrut在相对于分子中最高项目的上标位置，即，\sqrt{2}。（现在和指令已经消失，放置^{\mathstrut}在 item 的右侧\sqrt{3}也可以。但是，如果和仍然存在，看起来会很糟糕。）\left\right\left\right

实施这些建议后，表格的前四行可能如下所示：

在此处输入图片描述

请注意，我还用 进行了替换\begin{center} \begin{tabular} ... \end{tabular} \end{center}，\[ \begin{array} ... \end{array} \]这样我就可以摆脱大量的$令牌。

\documentclass[12pt]{article}
%% I've streamlined the preamble as much as possible for this example
\usepackage[hmargin=1.2in,vmargin=1in]{geometry}
\usepackage{array}
\newcolumntype{C}{>{\displaystyle}c<{}}

\begin{document}

\[
\renewcommand\arraystretch{2}
    \begin{array}{|C|C|C|C|} % displaystyle math in all columns
    \hline
    \theta$ (radians)$ & \sin\theta & \cos\theta & \tan\theta \\
    \hline
    0 & 0 & 1 & 0 \\%0deg
    \hline
      \frac{\pi}{12_{\mathstrut}}
    & \frac{{\sqrt{2}}^{\mathstrut} \,(\sqrt{3}-1)}{4}     
    & & \\%15deg
    \hline
    \frac{\pi}{10_{\mathstrut}} & & & \\%18deg
    \hline
    \end{array}
\]
\end{document}

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