NAME
atan, atanf,
atanl —
arc tangent function of one
variable
LIBRARY
library “libm”
SYNOPSIS
#include
<math.h>
double
atan(double
x);
float
atanf(float
x);
long double
atanl(long
double x);
DESCRIPTION
Theatan(),
atanf(),
and
atanl()
functions compute the principal value of the arc tangent of
x in the range [-pi/2, +pi/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
ISO/IEC 9899:1999
(“ISO C99”).