Exercise algebra.manipulation.rational.simplify
Description
simplify a rational expression (with a variable in a divisor)
Derivation
(a^2-3*a-10)/(a^2-a-20)
⇒ algebra.equations.quadratic.nice-factors(a^2-3*a-10)/((a+4)*(a-5))
⇒ algebra.equations.quadratic.nice-factors(a+2)*(a-5)/((a+4)*(a-5))
⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (a /= 5)](a+2)/(a+4)