function acovercosf( x ) {
	return asinf( float64ToFloat32( float64ToFloat32( x ) - 1.0 ) );
}
Computes the inverse coversed cosine of a single-precision floating-point number (in radians).

@param {number} x - input value
@returns {number} inverse coversed cosine

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

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

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

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