Changes
http://wiki.axiom-developer.org/293Integrate11X4XMinusInfinityPlusInfinity/diff
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\begin{axiom}
integrate(1/(1+x^4),x=%minusInfinity..%plusInfinity)
\end{axiom}
is obviously wrong.
\begin{axiom}
integrate(1/(1+x^4),x)
\end{axiom}
is an antiderivative only for $x\not\in\{-\frac{\sqrt2}2,\frac{\sqrt2}2\}$. The
correct antiderivative, i.e., which is defined on all of $\mathbb R$ can be
obtained from the above expression by replacing $\atan\frac1z$ with
$\frac\pi2-\atan z$.
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