64a^3 - 27b^3 - 8c^3 -72abc
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(a)³+(3b)³+(2c)³-3(a)(3b)(2c)
using formula a³+b³+c³-3abc = (a+b+c)(a²+b²+ c²-ab-bc-ca)
using formula a³+b³+c³-3abc = (a+b+c)(a²+b²+ c²-ab-bc-ca)
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