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Maxima uses the substitution t = exp(-y) to change the

integral from 0 to 1 to 0 to inf. Then it uses its routine

to handle this infinite integral by converting it to an

integral from minf to inf, because the integrand is even.

Finally, it uses rectzto%pi2 to integrate this final

integrand.

rectzto%pi2 needs to find the poles of the denominator. I'm

guessing it's getting that wrong.