Function CalcSomething(ByVal input as Single)
   CalcSomething = ... <some math using 'input'>
End Function

'other functions exist also...

static class A
{
    private static Calc calc1 = new Calc();

    public GetCalc() => calc1;
}

...

A.GetCalc.CalcSomething(1234); // CRASH!

static class A
{
    public GetCalc() => new Calc();
}

...

A.GetCalc.CalcSomething(1234); // NO CRASH.