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 3.0.2                      May 2, 1991                     NetBSD 3.0.2