NAME    [Toc]    [Back]

     atan, atanf - arc tangent function of one variable

LIBRARY    [Toc]    [Back]

     Math Library (libm, -lm)

SYNOPSIS    [Toc]    [Back]

     #include <math.h>

     double
     atan(double x);

     float
     atanf(float x);

DESCRIPTION    [Toc]    [Back]

     The atan() and atanf() functions compute the principal value of the arc
     tangent of x in the range [-pi/2, +pi/2].

SEE ALSO    [Toc]    [Back]

     acos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
     tan(3), tanh(3)

STANDARDS    [Toc]    [Back]

     The atan() functions conforms to ANSI X3.159-1989 (``ANSI C'').

BSD                               May 2, 1991                              BSD