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Exercise "math"

Calculate (using System.Math class) √2, e^π, π^e and save the results in variables, like
```
double sqrt2=Sqrt(2.0);
```
Write the values of these variables out, like
```
Write($"sqrt(2) = {sqrt2}\n");
```
Check that the results are correct (by applying the corresponding inverse functions), like
```
Write($"sqrt2*sqrt2 = {sqrt2*sqrt2} (should be equal 2)\n");
```

Hints

In the Makefile, you should redirect the output of your program to a file, like

Out.txt: main.exe
	mono main.exe > Out.txt

main.exe: main.cs
	mcs main.cs