Support results larger than f64

[izissise]

It would be nice if the calcul is larger than the size of f64 it display the exact value

[pickfire]

Not exactly, #34 would be more useful to display the exact value that you see in calculator.

[JensGrabner]

In Planmaker from Softmaker have a correct result.

[pickfire]

I tried doing this with num's Ratio, it doesn't support f64 methods like sin so I am not sure what to do here.