ATAN(3) Linux Programmer's Manual ATAN(3)
NAME
atan - arc tangent functionSYNOPSIS
#include <math.h> double atan(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
acos, asin, atan2, cos, sin, tan,
June 8, 1993 1
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