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Document the optional second arg of `atan'.

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This commit is contained in:
Eli Zaretskii 2002-02-19 11:07:20 +00:00
parent f120431c7e
commit c4f59bcf1f
1 changed files with 7 additions and 0 deletions
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7
etc/NEWS
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@ -625,6 +625,13 @@ and the latter now controls scrolling down.
This is like window-height but does not count the mode line
or the header line.
+++
** The function `atan' now accepts an optional second argument.
When called with 2 arguments, as in `(atan Y X)', `atan' returns the
angle in radians between the vector [X, Y] and the X axis. (This is
equivalent to the standard C library function `atan2'.)
+++
** You can now make a window as short as one line.