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DataPRO/FftSharp/Windows/Cosine.cs

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+using System;
+
+namespace FftSharp.Windows
+{
+    public class Cosine : Window, IWindow
+    {
+        public override string Name => "Cosine";
+        public override string Description =>
+            "This window is simply a cosine function. It reaches zero on both sides and is similar to " +
+            "Blackman, Hamming, Hanning, and flat top windows, but probably should not be used in practice.";
+
+        protected override double windowValue(int index, int size)
+        {
+            return Math.Sin(index * Math.PI / (size - 1));
+        }
+    }
+}