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Comment #10 on issue 1720 by plaes800: integrate(asin(x/2),x) crashes
http://code.google.com/p/sympy/issues/detail?id=1720
Ahh.. thanks for pointing out the solution. I was also worried about all
these simplify() calls. :)
I went through all the code that calls code from sympy.simplify and
replaced simplify with Poly.cancel(),
and it turns out that we really didn't need to use together() either. I
pushed new patch to github bug-1270-v2
branch..
While investigating this issue, I noticed that our integrator does not
handle atan(x) and acosh(x) correctly.
Fortunately the risch() algorithm is correct, but failure comes from
Mul._eval_subs() :S
Here's an example:
[i] print (diff(acosh(x), x, x).subs(diff(acosh(x), x), z))
[o] x*z/(1 - x**2)
Here the (1-x**2) should really be sqrt(1 - x)*sqrt(1-x), but subs() fails
at it...
The issue with atan(x) and acos(x/2) is basically the same..
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