Exercise algebra.manipulation.rational.simplify
Description
simplify a rational expression (with a variable in a divisor)
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
(a^2+a-2)/((a+1)*(a+2))
⇒ algebra.equations.quadratic.nice-factors(a-1)*(a+2)/((a+1)*(a+2))
⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (a /= -2)](a-1)/(a+1)