Apart — decompose into partial fractions with minimal denominators
Together — put rational functions over a common denominator
Cancel — cancel common factors between numerator and denominator
Numerator,
Denominator — pick out numerator, denominator
Factor — factor numerator and denominator, canceling common factors
Expand — expand everything except denominators
ExpandAll — expand everything, including denominators
ExpandNumerator,
ExpandDenominator — expand numerators and denominators only
PadeApproximant — find a rational approximation to any function
