solve using identity (2a-3b)³
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(2a−3b) ^3
=(2a)^3 +(−3b)^3 +3(2a)(−3b)(2a−3b)
=(8a)^3−(27b )^3−18ab(2a−3b)
=(8a)^3−(27b)^3 −36a^2b+54ab^2.
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may it help uh
use formula...
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