NAME
atan
,
atanf
- arc tangent function of one variable
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
double
atan
(
double x
)
float
atanf
(
float x
)
DESCRIPTION
The
atan
(
) and
atanf
(
) functions compute the principal value of the arc tangent of
x
in the range [-/2, +/2].
SEE ALSO
acos(3)
,
asin(3)
,
atan2(3)
,
cos(3)
,
cosh(3)
,
math(3)
,
sin(3)
,
sinh(3)
,
tan(3)
,
tanh(3)
STANDARDS
The
atan
(
) functions conforms to ANSI X3.159-1989 (``ANSI C89'') .