hpux man page for atan

atan(3M)																  atan(3M)

NAME
       atan(), atanf(), atanl(), atanw(), atanq() - arctangent functions

SYNOPSIS
   HP Integrity Server Only
DESCRIPTION
       returns the arctangent of x,

       is a version of it takes a argument and returns a result.

   Integrity Server Only
       is a version of it takes a argument and returns a result.

       is an version of it takes an argument and returns an result.

       is equivalent to on HP-UX systems.

USAGE
       To use these functions compile either with the default option or with the and the options.

       To use (for Integrity servers) or compile also with

       To use any of these functions, make sure your program includes and link in the math library by specifying on the compiler or linker command
       line.  For more information, see the at the following site:

   PA-RISC Only
       Millicode versions of the and functions are available.  Millicode versions of math library functions are usually faster than their counter-
       parts in the standard library.  To use these versions, compile your program with the or the optimization option.

       For special cases, the millicode versions return the same values as their standard library counterparts (see the section).

RETURN VALUE
       If x

       If x is NaN, returns NaN.

       Whether raises the inexact exception is unspecified.

ERRORS
       No errors are defined.

SEE ALSO
       acos(3M), asin(3M), atand(3M), atan2(3M), catan(3M), cos(3M), sin(3M), tan(3M), math(5).

STANDARDS CONFORMANCE
       : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																	  atan(3M)