(a+3)³-3a(a+1) tell ans of this question
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Cube =(3a-1/a)³ =27a³-1-3 x 3a 1(3a-1)/a³ =27a³-1-9a(3a-1)/a³ =27a³-1- 27a²+9a/a³ =27a³-27a²+9a-1/a³. Hope it helps you
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