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

NAME
     atan, atanf -- arc tangent function of one variable

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <&lt;math.h>&gt;

     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