As far as I can tell, there is no simple way to call maxima's changevar function from maxima. It is, however, sometimes quite useful for solving some integrals. Consider foo(x)=e^((m - x)/s)/((e^((m - x)/s) + 1)^2*s) : in maxima, changevar allows for easy checking that integrate((x-m)^2*foo(x),x,-oo,oo)==s^2*pi^2/3 (direct integration doeszn't succeed in Maxima, nor in sage). The only way I found was to open a maxima console. Shouldn't this function be added to sage ? (it entails passing unevaluater integrate forms to maxima, but that is probably doable via existing tools).
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