[docs] [issue37548] Document range of atan, acos and asin

[Mark Dickinson]

New submission from Mark Dickinson <dickinsm at gmail.com>:

A small nice-to-have: it would be good to document the range of the inverse trigonometric functions `math.atan`, `math.asin` and `math.acos`, in both the docstrings and the built documentation.

There are standard "principal values" for each of these inverses, and Python is using these standard values, but that may not be obvious to a user.

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assignee: docs at python
components: Documentation
messages: 347620
nosy: docs at python, mark.dickinson
priority: normal
severity: normal
status: open
title: Document range of atan, acos and asin
versions: Python 2.7, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37548>
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