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(a-1)(a-1)(a-1)(a-1)=(a-1)²(a-1)²=(a²-2a+1)(a²-2a+1)=(a²-2a+1)²
(a²-2a+1)(a²-2a+1)=a⁴-2a³+a²-2a³+4a²-2a+a²-2a+1=a⁴-4a³+6a²-4a+1