Exercise algebra.manipulation.rational.simplify
Description
simplify a rational expression (with a variable in a divisor)
Derivation
(x^2-7*x+6)/((x-1)*(x+1))
⇒ algebra.equations.quadratic.nice-factors(x-1)*(x-6)/((x-1)*(x+1))
⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (x /= 1)](x-6)/(x+1)