(-1/3a^3b ^2)^2(-2ab^2)^3/(1/9a^4b^4)^2

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(-1/3a^3b^2)^2(-2ab^2)^3/(1/9a^4b^4)^2(-1/3a^3b^2)^2(-2ab^2)^3/(1/9a^4b^4)^2(-1/3a^3b^2)^2(-2ab^2)^3

(-1/3a^3b ^2)^2(-2ab^2)^3/(1/9a^4b^4)^2
(-1/3a^3b ^2)^2(-2ab^2)^3/(1/9a^4b^4)^2

(-1/3a^3b ^2)^2(-2ab^2)^3/(1/9a^4b^4)^2
(-1/3a^3b ^2)^2(-2ab^2)^3/(1/9a^4b^4)^2
=(-8/9a^9b^10)/(1/81a^8b^8)
=-72ab^2