a³-2a²+2²a+2(a²-2a+2²)= a³-2a²+2²a+2a²-2²a+2³= a³+2³
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a³-2a²+2²a+2(a²-2a+2²)= a³-2a²+2²a+2a²-2²a+2³= a³+2³