Text Decorations – How to Cross Out Sentences

Question

I had to cross out a sentence and I did it the following way, which is kinda sloppy.

$ \rlap{\textbf{-------------------------------------------------------------------------------------------------}}%
{\mbox{Its derivative should be}}$ $2z + 2\bar{z} =4Re[z]$ So are its critical points all over the real axis? 

is there a better way to do this and get the same result?

Answer 1

Use the either the ulem package or the soul package.

\documentclass{article}
\usepackage[normalem]{ulem} % either use this (simple) or
\usepackage{soul} % use this (many fancier options)
\begin{document}

% ulem command
\sout{Its derivative should be $2z + 2\bar{z} =4Re[z]$ So are its critical points all over the real axis?} 

% soul command
\st{Its derivative should be $2z + 2\bar{z} =4Re[z]$ So are its critical points all over the real axis?} 
\end{document}