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ATAN(3)                     BSD Programmer's Manual                    ATAN(3)

NAME
     atan - arc tangent function of one variable

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

     double
     atan(double x);

DESCRIPTION
     The atan() function computes the principal value of the arc tangent of x.
     For a discussion of error due to roundoff, see math(3).

RETURN VALUES
     The atan() function returns the arc tangent in the range [-pi/2, +pi/2]
     radians.

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

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

4.4BSD                           June 4, 1993                                1