[issue7534] float('nan')**2 != nan. float('nan')**2 error 33 on windows

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +mark.dickinson
priority:  -> normal

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7534>
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