SIN(3M)                 COMMAND REFERENCE                 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 tan(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 of x in the range -pi /2 to pi /2.

     Acos returns the arc cosine of x in the range 0 to pi .

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

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

FILES
     /usr/lib/libm.a          Mathematical library functions.

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.

SEE ALSO
     intro(3m).



Printed 10/17/86                                                1

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