Exercise algebra.manipulation.rational.simplify

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

Derivation

(x^2-9)/(x^2+6*x+9)

⇒ algebra.equations.quadratic.nice-factors

(x^2-9)/(x+3)^2

⇒ algebra.equations.quadratic.nice-factors

(x+3)*(x-3)/(x+3)^2

⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (x /= -3)]

(x-3)/(x+3)