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ATANIndexNAMEatan, atanf, atanl - arc tangent functionSYNOPSIS#include <math.h> double atan(double x); float atanf(float x); long double atanl( long double x); DESCRIPTIONThe fBatan()fP function calculates the arc tangent of fIxfP; that is the value whose tangent is fIxfP.RETURN VALUEThe fBatan()fP 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 9899. The float and long double variants are C99 requirements.SEE ALSOacos(3), asin(3), atan2(3), cos(3), sin(3), tan(3)
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