expands out products and powers that appear in the numerator of expr.

Details and Options

  • ExpandNumerator works on terms that have positive integer exponents.
  • ExpandNumerator applies only to the top level in expr.
  • ExpandNumerator automatically threads over lists, as well as equations, inequalities, and logic functions.


open allclose all

Basic Examples  (1)

Expand the numerator of a fraction:

Scope  (3)

Expand the numerator of a rational function:

ExpandNumerator threads over sums:

ExpandNumerator threads over Boolean combinations of equations and inequalities:

Options  (2)

Modulus  (1)

Expand the numerator over the integers modulo 3:

Trig  (1)

Expand the numerator using expansion formulas for trigonometric functions:

Properties & Relations  (5)

ExpandNumerator leaves the denominator unexpanded:

ExpandDenominator expands the denominator, leaving the numerator unexpanded:

Expand expands the numerator and expands the fraction into a sum of fractions:

ExpandAll expands the numerator, the denominator, and the fraction:

Use Factor, Numerator, and Denominator to factor the numerator back:

Introduced in 1988
Updated in 2007