Cancelling terms in maths expressions

A technique used when explaining the behaviour of expressions or equations (often for pedagogical purposes). The cancel package provides several variants of cancellation marks (“\”, “/” and “X”), and a means of cancelling ‘to’ a particular value.

Documentation of cancel is in the package file.

cancel.sty

macros/latex/contrib/misc/cancel.sty

This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=cancellation