Добавлены операци:

SqrtY,
Factorial,
CubeRoot,
Square,
Cube,
PowY,
Log,
Ln,
Exp,
Inv,
Pi,
Sinh,
Sin,
Cosh,
Cos,
Tanh,
Tan

Commands/CalculateCommand.cs

@@ -0,0 +1,38 @@
+using calculator.Common;
+using calculator.Model;
+using calculator.Services;
+
+namespace calculator.Commands;
+
+public class CalculateCommand : ICommand
+{
+    private readonly ICaculator _caculator;
+    private readonly CaculatorData _data;
+    private readonly double? _b;
+    private readonly Operation _operation;
+    private double? _previousValue;
+
+    public CalculateCommand(ICaculator caculator, CaculatorData data)
+    {
+        _caculator = caculator;
+        _data = data;
+        _operation = data.Operation.Value;
+        
+        if (double.TryParse(data.Input, out var b)) 
+            _b = b;
+    }
+
+    public void Execute()
+    {
+        if (_data.Value is null)
+            return;
+        _previousValue = _data.Value;
+        _data.Value = _caculator.Calculate(_operation, _data.Value.Value, _b);
+        _data.Input = null;
+    }
+
+    public void Undo()
+    {
+        _data.Value = _previousValue;
+    }
+}

Commands/ICommand.cs

@@ -0,0 +1,7 @@
+namespace calculator.Commands;
+
+public interface ICommand
+{
+    void Execute();
+    void Undo();
+}