Factorize each of the following expression:p2q2 − p4q4
$p^{2} q^{2}-p^{4} q^{4}$
$=p^{2} q^{2}\left(1-p^{2} q^{2}\right)$
$=p^{2} q^{2}\left[1-(p q)^{2}\right]$
$=p^{2} q^{2}(1-p q)(1+p q)$
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