I have this expression
Simplify[2 wb Z - 2 w xiR^4 Zb - 2 xiR^2 Sqrt[(wb Z - w xiR^4 Zb)^2/xiR^4]]
which is actually zero when just calculated by hand, with no assumptions needed...
Simplify just give the expression back within the brackets. Why is this?
Here in my case,
Zb are complex-valued,
A is real.