### 11.6.3 Denominator

The getDenom command finds the denominator of an unreduced rational function.

- getDenom takes rat, a rational function.
- getDenom(rat) returns the denominator of rat.

Unlike denom (see Section 11.6.4), textttgetDenom does not simplify the expression before extracting the denominator.

#### Examples

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

x−1 |  |  |  |  |  |  |  |  |  |

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

x2−1 |  |  |  |  |  |  |  |  |  |