Exercise algebra.manipulation.rational.simplify

Description
simplify a rational expression (with a variable in a divisor)

Derivation

Final term is not finished

(a+3)*(a-3)/(a^3-4*a^2+3*a)

⇒ algebra.equations.linear.distr-times

(a^2-9)/(a^3-4*a^2+3*a)