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atanf(3) [netbsd man page]

ATAN(3) 						   BSD Library Functions Manual 						   ATAN(3)

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''). BSD
May 2, 1991 BSD
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