# bug? multiply symbolic exponents

Is this a bug ?

```
sage: var('a b c x y z')
(a, b, c, x, y, z)
sage: assert( (e^x)^y == e^(x*y) )
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
/Users/marks/mysage/sage-9.0/local/lib/python3.7/site-packages/sage/all_cmdline.py in <module>()
----> 1 assert( (e**x)**y == e**(x*y) )
AssertionError:
sage: assert( (e^2)^3 == e^(2*3) )
sage:
```

but