public static double Highprecision_Exp(double x) {
        return (362880 + x * (362880 + x * (181440 + x * (60480 + x * (15120 + x * (3024 + x * (504 + x * (72 + x * (9 + x))))))))) * 2.75573192e-6;
    }
public static double Highprecision_Exp ( double x ) { return ( 362880 + x * ( 362880 + x * ( 181440 + x * ( 60480 + x * ( 15120 + x * ( 3024 + x * ( 504 + x * ( 72 + x * ( 9 + x ) ) ) ) ) ) ) ) ) * 2.75573192e-6 ; }
Calculate Exp.
Exp by Taylor series (9).

@param x Value.
@return Exponential.