In [2]: math.tan(math.pi/2)
Out[2]: 16331778728383844.0
so I thought maybe that was a float limit which it probably is as you get weird results from higher values but it seems strange that it tries to run with it.
In [5]: 16331778728383844.0
Out[5]: 16331778728383844.0
In [6]: 16331778728383845.0
Out[6]: 16331778728383844.0
In [7]: 16331778728383846.0
Out[7]: 16331778728383846.0
In [8]: 16331778728383845.0
Out[8]: 16331778728383844.0
In [9]: 16331778728383847.0
Out[9]: 16331778728383848.0
In [10]: 16331778728383848.0
Out[10]: 16331778728383848.0
weird huh?
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