On Wed, Dec 20, 2023 at 07:40:00AM +0800, Qian Yun wrote:
> integrate(atan(x*(x^2+1)^(1/2)),x)
> integrate(tanh(x)/(exp(x)+exp(2*x))^(1/2),x)
> integrate((2+2*tan(x)+tan(x)^2)^(1/2),x)
> ...
>
> These integrals are different between trunk and this patch.
> (same as 1.3.9.)
Yes, thanks. In trunk case of biquadratic with two complex
roots is unhandled. We can send it to 'quartic2'. But
I am looking at 'quartic2', currently it assumes that
all roots are complex and was intended to fail otherwise.
But it seems that I missed some cases where 'quartic2'
goes on but roots are real. And in fact, it should be
possible to handle real roots in 'quartic2'.
--
Waldek Hebisch
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