On Wed, 17 Oct 2018 at 10:59, M Kamimura <kamimu...@gmail.com> wrote:
>
> My calculation results are 14, but sympy's calculation results are 2 and 4.
>
> https://www.mkamimura.com/2018/10/python-javascript_17.html
>
> Is it my mistake, or sympy's bug?

It's a bug:

In [4]: abs(sin(x)).integrate((x, 0, 8*pi))
Out[4]: 4

In [5]: abs(sin(x)).integrate((x, 0, 4*pi))
Out[5]: 4

In [6]: abs(sin(x)).integrate((x, 4*pi, 8*pi))
Out[6]: 0

--
Oscar

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