P+Q = -R
(P+Q)3 = -R3
P3+Q3+3PQ(P+Q) = -R3
P3+Q3+R3 = =3PQ(P+Q)
P3+Q3+R3 = 3PQR

NOW,
P2/QR+Q2/PR+R2/PQ=(P3+Q3+R3)PQR = 3

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