DragonFly On-Line Manual Pages


ATAN(3) 	      DragonFly Library Functions Manual	       ATAN(3)

NAME

atan, atanf, atanl -- arc tangent functions of one variable

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h> double atan(double x); float atanf(float x); long double atanl(long double x);

DESCRIPTION

The atan(), atanf(), and atanl() functions compute the principal value of the arc tangent of x.

RETURN VALUES

These functions return the arc tangent in the range [-pi/2, +pi/2] radi- ans.

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(), atanf(), and atanl() functions conform to ISO/IEC 9899:1999 (``ISO C99''). DragonFly 4.1 December 21, 2011 DragonFly 4.1