Numerator

The getNum command finds the numerator of an unreduced rational function.

Unlike numer (see Section 11.6.2), textttgetNum does not simplify the expression before extracting the numerator.

getNum((x^2-1)/(x-1))

x²−1

getNum((x^2+2*x+1)/(x^2-1))

x²+2 x+1