sin [function]
sin( x )
returns the sine of angle x in radians, as real
sin( 0 ); // real (0) sin( M_PI / 2 ); // real (1) sin( M_PI / 4 ); // real (0.707107)
x in radians, as realsin( 0 ); // real (0) sin( M_PI / 2 ); // real (1) sin( M_PI / 4 ); // real (0.707107)