plan9 man page for sin

SIN(2)								System Calls Manual							    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 -n/2 to n/2.

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

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

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

SOURCE
       /sys/src/libc/port

SEE ALSO
       intro(2)

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

																	    SIN(2)