Denominator Command

Denominator[ <Function> ]

Returns the denominator of a function.

Example:

Denominator[5 / (x^2 + 2)] yields f(x)=(x² + 2).

CAS Syntax

Denominator[ <Expression> ]

Returns the denominator of a rational number or expression.

Example:

Denominator[2 / 3 + 1 / 15] yields 15.

Note:

See also Numerator Command.

Note:

For a fast numerical method (so long as the numbers aren't too big) you can use these in the Input Bar: CommonDenominator[a,a] for denominator and round(a*CommonDenominator[a,a]) for Numerator