Exercise algebra.manipulation.rational.simplify
Description
simplify a rational expression (with a variable in a divisor)
Derivation
(p^2-12*p+36)/(p*(p-6))
⇒ algebra.equations.quadratic.nice-factors(p-6)^2/(p*(p-6))
⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (p /= 6)](p-6)/p