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atan(3) -- Linux man page
NAME
atan, atanf, atanl - arc tangent function
SYNOPSIS
#include <math.h>
double atan(double x);
float atanf(float x);
long double atanl( long double x);
DESCRIPTION
The atan() function calculates the arc tangent of x; that is
the value whose tangent is x.
RETURN VALUE
The atan() function returns the arc tangent in radians and the
value is mathematically defined to be between -PI/2 and PI/2
(inclusive).
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899.
The float and long double variants are C99 requirements.
SEE ALSO
acos(3),
asin(3),
atan2(3),
cos(3),
sin(3),
tan(3)
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