Option variable
radexpandDefault value: true
radexpand controls some simplifications of radicals.
When radexpand is all, causes nth roots of
factors of a product which are powers of n to be pulled outside of the
radical. E.g. if radexpand is all, sqrt (16*x^2) simplifies to 4*x.
More particularly, consider sqrt (x^2).
If radexpand is all or assume (x > 0) has been executed,
sqrt(x^2) simplifies to x.
If radexpand is true and domain is real (its default),
sqrt(x^2) simplifies to abs(x).
If radexpand is false, or radexpand is true and domain is complex,
sqrt(x^2) is not simplified.
Note that domain only matters when radexpand is true.