Online Algebra Calculator
Many of users do not use powerful Maxima computer algebra system for systematic work, but for ad hoc algebraic calculations – equations, functions, matrixes, etc. only. To do this job, it is not useful to download the whole application from a web site.
Function: expandwrt (<expr>, <x_1>, ..., <x_n>) Expands expression expr with respect to the variables <x_1>, ..., <x_n>. All products involving the variables appear explicitly. The form returned will be free of products of sums of expressions that are not free of the variables. <x_1>, ..., <x_n> may be variables, operators, or expressions.

By default, denominators are not expanded, but this can be controlled by means of the switch expandwrt_denom.
This function is autoloaded from simplification/stopex.mac.
There are also some inexact matches for expandwrt. Try ?? expandwrt to see them.
(%o1) true (%i2)