SIN()
 Computes the sine of a radian value
------------------------------------------------------------------------------
 Syntax

     SIN(<nArc>) --> nSine

 Argument

     <nArc>  Designates the radian value to determine as a sine.

 Returns

     SIN() returns the sine for the <nArc> specified value.

 Description

     SIN() determines the sine of a a specified radian value.

 Example

     Show some sine calculations:

     ? STR(SIN(PI() /4), 18, 15)         // 0.707106781186548
     ? STR(SIN(PI() /2), 18, 15)         // 1.000000000000000
     ? STR(SIN(PI() *99.5), 18, 15)      //-1.000000000000000
     ? STR(SIN(PI() /9), 18, 15)         // 0.342020143325669