atan(3) - NetBSD Manual Pages

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ATAN(3)                 NetBSD Library Functions Manual                ATAN(3)


NAME
atan, atanf -- arc tangent function of one variable
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double atan(double x); float atanf(float x);
DESCRIPTION
The atan() and atanf() functions compute the principal value of the arc tangent of x in the range [-pi/2, +pi/2].
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() functions conforms to ANSI X3.159-1989 (``ANSI C89''). NetBSD 5.0 May 2, 1991 NetBSD 5.0
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