function ibetaFraction2( a, b, x, y, normalized, out ) {
	var result;
	var fract;
	var f;

	result = ibetaPowerTerms( a, b, x, y, normalized );
	if ( out ) {
		out[ 1 ] = result;
	}
	if ( result === 0.0 ) {
		return result;
	}
	f = ibetaFraction2t( a, b, x, y );
	fract = continuedFraction( f, OPTS );
	return result / fract;
}
Evaluates the incomplete beta via the continued fraction representation.

@private
@param {NonNegativeNumber} a - function parameter
@param {NonNegativeNumber} b - function parameter
@param {Probability} x - function parameter
@param {Probability} y - probability equal to `1-x`
@param {boolean} normalized - boolean indicating whether to evaluate the power terms of the regularized or non-regularized incomplete beta function
@param {(Array|TypedArray|Object)} out - output array holding the derivative as the second element
@returns {number} incomplete beta value