Comment #2 on issue 3883 by asmeu...@gmail.com: powdenest should not do too much
http://code.google.com/p/sympy/issues/detail?id=3883

Similarly, the other power functions should not do denesting:

In [19]: var('a b c', positive=True)
Out[19]: (a, b, c)

In [20]: expand_power_base((a**b)**(c + 1))
Out[20]:
 b⋅(c + 1)
a

In [21]: expand_power_exp((a**b)**(c + 1))
Out[21]:
 b⋅(c + 1)
a

The first should leave it alone, and the second should do (a**b)**c*a**b. It defeats the whole purpose of having separated targeted simplification functions if they aren't actually separated.

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