EFUN: asin

SYNTAX:
float sin( x );
  float x;

DESCRIPTION:
Calculates the arcsine of x. X must be a value between -1 and 1.

RETURN VALUE:
The value of asin( x ) is returned (varies between -0.5*PI and 0.5*PI).

SEE ALSO:
sin
acos
atan

EXAMPLE:
float x;

x = sin( 0 );
// x has now a value of 0.
