6.7.5  Numerator and denominator of a fraction: f2nd fxnd

The f2nd command finds the numerator and denominator of a fraction.
fxnd is a synonym for f2nd.

• f2nd takes one argument:
  r, a fraction.
• f2nd(r) returns the list of the numerator and denominator of r after it has been reduced to lowest terms. (For rational expressions see Section 6.32.5).

Example.
Input:

Output: