long double     SqrtAB07(long double x, long double c)
{
    long double     x2 = x * x;
    long double     x4 = x2 * x2;
    long double     x8 = x4 * x4;
    long double     c2 = c * c;
    long double     c4 = c2 * c2;
    long double     ans0 =
    (x4 * x4 + val28 * (x2 * c * (x4 + c2)) + val70 * c2 * x4 + c2 * c2) /
    (x * (x2 + c) * (x4 + val6 * x2 * c + c2)) * valOneEighth;
    long double     ans1 = c / ans0;
    return (ans0 + ans1) * valOneHalf;
}