find the sum of p(p-q), q(q-r) and r(r-p)
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= p(p-q) + q(q-r) + r(r-p)
= p^2 - pq + q^2 - qr + r^2 - pr
= p^2 + q^2 + r^2 - (pq + qr + pr)
It can't be simplified anymore
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