SIN(2)                                                     SIN(2)

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

     SYNOPSIS
          #include <u.h>
          #include <libc.h>

          double sin(double x)

          double cos(double x)

          double tan(double x)

          double asin(double x)

          double acos(double x)

          double atan(double x)

          double atan2(double y, double x)

     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 sine in the range -π/2 to π/2.

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

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

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

     SOURCE
          /sys/src/libc/port

     SEE ALSO
          intro(2)

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