(4a^2 b^-5)^3= 64a^6 b^-15(6a^4 b^3)^2= 36a^8 b^664a^6 b^-15 / 36a^8 b^6= 16/9 a^-2 b^-21= 16/9a^2 b^21
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(4a^2 b^-5)^3
= 64a^6 b^-15
(6a^4 b^3)^2
= 36a^8 b^6
64a^6 b^-15 / 36a^8 b^6
= 16/9 a^-2 b^-21
= 16/9a^2 b^21