function acoversinf( x ) {
	return addon( x );
}
Computes the inverse coversed sine of a single-precision floating-point number (in radians).

@private
@param {number} x - input value
@returns {number} inverse coversed sine (in radians)

@example
var v = acoversinf( 3.141592653589793 / 2.0 );
// returns ~-0.6075

@example
var v = acoversinf( 0.0 );
// returns ~1.5708

@example
var v = acoversinf( 3.141592653589793 / 6.0 );
// returns ~0.4966

@example
var v = acoversinf( -1.0 );
// returns NaN

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