Commit f120431c authored by Eli Zaretskii's avatar Eli Zaretskii
Browse files

(Math Functions): Document the optional second arg of atan.

parent 250ffca6
......@@ -1046,8 +1046,8 @@ pi
is out of range (outside [-1, 1]), then the result is a NaN.
@end defun
@defun atan arg
The value of @code{(atan @var{arg})} is a number between
@defun atan y &optional x
The value of @code{(atan @var{y})} is a number between
@end ifnottex
......@@ -1061,7 +1061,10 @@ pi/2
@end tex
(exclusive) whose tangent is @var{arg}.
(exclusive) whose tangent is @var{y}. If the optional second
argument @var{x} is given, the value of @code{(atan y x)} is the
angle in radians between the vector @code{[@var{x}, @var{y}]} and the
@code{X} axis.
@end defun
@defun exp arg
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