3) Factorize:
p4+q4 + p2q2
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Answer:
p4+q4+p2q2
=p4+q4+2(p2q2)-p2q2
=(p2+q2)2 -(p2q2)2
=(p2+q2)2-(pq)2
=(p2+q2+pq)(p2+q2-pq)
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