sin(3M) — GENIX 4.1A



      SIN(3M)                 GENIX Programmer's Manual                 SIN(3M)



      NAME
           sin, cos, tan, asin, acos, atan, atan2 - trigonometric functions

      SYNOPSIS
           #include <math.h>

           double sin(x)
           double x;

           double cos(x)
           double x;

           double asin(x)
           double x;

           double acos(x)
           double x;

           double atan(x)
           double x;

           double atan2(x, y)
           double x, y;

      DESCRIPTION
           Sin, cos and tan return trigonometric functions of radian arguments.
           The  magnitude  of  the  argument should be checked by the caller to
           make sure the result is meaningful.

           Asin returns the arc sin in the range -π/2 to π/2.

           Acos returns the arc cosine in the range 0 to π.

           Atan returns the arc tangent of x in the range -π/2 to π/2.

           Atan2 returns the arc tangent of x/y in the range -π to π.

      DIAGNOSTICS
           Arguments of magnitude greater than 1 cause asin and acos to  return
           value  0;  errno  is  set to EDOM.  The value of tan at its singular
           points is a huge number, and errno is set to ERANGE.

      BUGS
           The value of tan for arguments greater than about 2**31 is garbage.











      Printed 11/16/83                                                        1
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