function sind( x ) {
	return addon( x );
}
Computes the sine of an angle measured in degrees.

@private
@param {number} x - input value (in degrees)
@returns {number} sine

@example
var v = sind( 0.0 );
// returns 0.0

@example
var v = sind( 90.0 );
// returns 1.0

@example
var v = sind( 30.0 );
// returns ~0.5

@example
var v = sind( NaN );
// returns NaN