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(2a)^6+6(2a)^5.(-3b)+15(2a)^4.(-3b)²+20(2a)³.(-3b)³+15.(2a)²(-3b)^4+6(2a).(-3b)^5+(-3b)^6
64a^6 - 576a^5.b + 720a^4.b² - 4320a³.b³ + 4860a².b^4 - 2916ab^5 + 729b^6