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Verify that p3 + q3 + r3 – 3pqr = (p + q + r) 

(p2 + q2 + r2 – pq – qr – rp)

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RHS = (p + q + r)

= p3 + q+ r3 – pqr – pqr – pqr

= p3 + q3 + r3 – 3pqr

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