Добавлены операци:

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

Commands/ICommand.cs

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