How to add extra spaces between rows in tabular environment?

You have at least three options here:

  • Increasing the array stretch factor using \renewcommand{\arraystretch}{<factor>} where <factor> is a numeric value:

    \documentclass{article}
    \begin{document}
    \renewcommand{\arraystretch}{2}
    \begin{tabular}{c c}
      $f^{(n)}(x)$ & $f^{(n)}(0)$ \\\hline
      $-2xe^{-x^{x^{x^2}}}$ & 0
    \end{tabular}
    \end{document}
    

    enter image description here

  • Explicitly specifying the row skip using \\[<len>] where <len> is any length:

    \documentclass{article}
    \begin{document}
    \begin{tabular}{c c}
      $f^{(n)}(x)$ & $f^{(n)}(0)$ \\[1cm] \hline
      $-2xe^{-x^{x^{x^2}}}$ & 0
    \end{tabular}
    \end{document}
    

    enter image description here

  • Modifying the array package's \extrarowheight length using \setlength{\extrarowheight}{<len>}, where <len> is any length:

    \documentclass{article}
    \usepackage{array}% http://ctan.org/pkg/array
    \begin{document}
    \setlength{\extrarowheight}{20pt}
    \begin{tabular}{c c}
      $f^{(n)}(x)$ & $f^{(n)}(0)$ \\\hline
      $-2xe^{-x^{x^{x^2}}}$ & 0
    \end{tabular}
    \end{document}
    

    enter image description here

In the above examples, the \hline was used to illustrate the effect of the different styles used. The choice depends on the specific usage/typesetting of the tabular within your document.

Finally, if the contents of your entire tabular is math, you could typeset it in an array environment:

\[
  \begin{array}{c c}
    f^{(n)}(x) & f^{(n)}(0) \\
    -2xe^{-x^{x^{x^2}}} & 0
  \end{array}
\]

You can use booktabs. Left is the output using \midrule, right the one with the \hline approach.

The left table is also improved by stating \displaystyle that uses less cramped superscripts.

\documentclass{article}
\usepackage{array,booktabs}
\newcolumntype{C}{>{$\displaystyle}c<{$}}

\begin{document}

\begin{tabular}{CC}
f^{(n)}(x) & f^{(n)}(0) \\
\midrule
-2xe^{-x^{x^{x^2}}} & 0
\end{tabular}
\qquad
\begin{tabular}{cc}
$f^{(n)}(x)$ & $f^{(n)}(0)$ \\
\hline
$-2xe^{-x^{x^{x^2}}}$ & 0
\end{tabular}

\end{document}

enter image description here


You have another option here - specifying row colors:

\documentclass{article}
\usepackage{color, colortbl}
%Light gray:
\definecolor{Gray}{gray}{0.9}

%Light cyan:
\definecolor{LightCyan}{rgb}{0.88,1,1}

\begin{document}
\renewcommand{\arraystretch}{2}
\begin{tabular}{c c}
\rowcolor{Gray}
$f^{(n)}(x)$ & $f^{(n)}(0)$ \\\hline
\rowcolor{LightCyan}
$-2xe^{-x^{x^{x^2}}}$ & 0
\end{tabular}
\end{document}

Which gives you