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Incorrectly evaluated expression #24390

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proy87 opened this issue Dec 14, 2022 · 1 comment

proy87 commented Dec 14, 2022

sin(acos((98 - 14*cos(pi**2/2160))/(14*sqrt(50 - 14*cos(pi**2/2160))))) gives 0, but it is not 0.

The text was updated successfully, but these errors were encountered:

Contributor

oscarbenjamin commented Dec 14, 2022

The problem is that this incorrectly evaluates to 0 under evalf:

In [3]: a = acos((98 - 14*cos(pi**2/2160))/(14*sqrt(50 - 14*cos(pi**2/2160))))

In [4]: a.evalf(2)
Out[4]: 0

In [5]: a.evalf(3)
Out[5]: 0.000691

skirpichev added a commit to diofant/diofant that referenced this issue


          Add regression test

ee5af4d

Closes sympy/sympy#24390

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