New submission from Mark Dickinson <dicki...@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.

----------
assignee: docs@python
components: Documentation
messages: 347620
nosy: docs@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 <rep...@bugs.python.org>
<https://bugs.python.org/issue37548>
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