Helpful Extension Methods for Double

DoubleExt.cs

namespace System
{
    public static class DoubleExt
    {
        public static bool IsZero(this double input)
        {
            return Math.Abs(0 - input) < Double.Epsilon;
        }

        public static double Divide(this double numerator, double denominator)
        {
            return denominator.IsZero() ? Double.NaN : numerator / denominator;
        }
    }
}