Simplify fourth root of a^20b^13

Math
a20b134
Rewrite a20b13 as (a5b3)4b.
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Rewrite a20 as (a5)4.
(a5)4b134
Factor out b12.
(a5)4(b12b)4
Rewrite b12 as (b3)4.
(a5)4((b3)4b)4
Rewrite (a5)4(b3)4 as (a5b3)4.
(a5b3)4b4
(a5b3)4b4
Pull terms out from under the radical.
a5b3b4
Simplify fourth root of a^20b^13
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