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)
(x^2+2*x-8)/((x+4)*(x+6))
⇒ algebra.equations.quadratic.nice-factors(x-2)*(x+4)/((x+4)*(x+6))
⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (x /= -4)](x-2)/(x+6)