How can i get the cancellation like in this picture?
Like i want to cancel the both two in $\displaystyle 2\cdot\frac 1{2}$
Hi,
[tex]\not 2 \cdot \frac{1}{\not 2}[/tex] gives $\displaystyle \not2\cdot\frac1{\not2}$
If you want to cancel long terms, take a look at this thread.