`` `` `` ``
es104
$a^4-4a^2b^2-1+4ab=$
$=a^4-1(4a^2b^2-4ab+1)=$
$=a^4-(2ab-1)^2=$
$=[a^2+(2ab-1)][a^2-(2ab-1)]=$
$=(a^2+2ab-1)(a^2-2ab+1)$
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