How to calculate the power of a number with the FBox?

FAQ #101240

 

This is possible to build a combination of Fbox to be able to calculate easily the power of a number.

With the following relations:

a=x^y
ln(a)=ln(x^y)
ln(a)=y*ln(x)

and

a=exp(y*ln(x))


The following example is the operation 3^4.