atan man page on 4.4BSD

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

NAME
     atan — arc tangent function of one variable

SYNOPSIS
     #include <math.h>

     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 [-π/2, +π/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 X3.159-1989 (“ANSI C89”).

BSD				 June 4, 1993				   BSD
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