Sprawdź i popraw błędy
(4k+1)(2k-1)-(k-1)(k-3)=8k do potęgi2-4k+2k-1-(k do potęgi 2+3k-k+3k)=7k do potęgi 2-4k-4
(4k+1)(2k-1)-(k-1)(k-3)=8k²-4k+2k-1-(k²-3k-k+3)=7k²+2k-4
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(4k+1)(2k-1)-(k-1)(k-3)=8k²-4k+2k-1-(k²-3k-k+3)=7k²+2k-4