expand ( 3a -4b) cube
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saranghae
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( 3a - 4b )³
= (3a)³ - (4b)³ - 3*3a*4b ( 3a - 4b )
= 9a³ - 4b³ - 36ab ( 3a - 4b )
= 9a³ - 4b³ - 108a²b + 144ab²
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