I have this expression

```
2 Csc[2 y[x2]] Sech[x[x2]]^2 (Cos[y[x2]]^4 Cosh[x[x2]]^8 Sin[y[x2]]^4)^(1/4)

```

which is 1. But Mathematica doesn't do the simplification. I know that Mathematica doesn't simplify square roots very well. What would be the conditions I must give?