class com.greensock.easing.Circ {
	public static function easeIn (t:Number, b:Number, c:Number, d:Number):Number {
		return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
	}
	public static function easeOut (t:Number, b:Number, c:Number, d:Number):Number {
		return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
	}
	public static function easeInOut (t:Number, b:Number, c:Number, d:Number):Number {
		if ((t/=d*0.5) < 1) return -c*0.5 * (Math.sqrt(1 - t*t) - 1) + b;
		return c*0.5 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
	}
}