(p-q) (p+q) (p square+q square)
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(p-q) (p+q) (p square + q square)
=(pp+pq-qp-qq) (p square +q square)
=(p square1+1+pq-qp-q square1+1) (p square 2 + q square 2)
=p square 4 -q square 4.
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