simplify
4root 81 x^8y^4z^8
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4 √ 8 1 x^8 y^4 z^8
=√3^4 x^8 y^4 z^8
=3 x^2 y z^2
=√3^4 x^8 y^4 z^8
=3 x^2 y z^2
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