Query: atan
OS: redhat
Section: 3
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
ATAN(3) Linux Programmer's Manual ATAN(3)NAMEatan - arc tangent functionSYNOPSIS#include <math.h> double atan(double x);DESCRIPTIONThe atan() function calculates the arc tangent of x; that is the value whose tangent is x.RETURN VALUEThe atan() function returns the arc tangent in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).CONFORMING TOSVID 3, POSIX, BSD 4.3, ISO 9899SEE ALSOacos(3), asin(3), atan2(3), cos(3), sin(3), tan(3) 1993-06-08 ATAN(3)
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