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Add: p^2 - q + r, q^2 - r + p and r^2 - p + q

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Add: p2 - q + r, q2 - r + p and r2 - p + q

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Required sum =(p2 − q + r) + (q2 − r + p) + (r2 − p + q)

= p2 + q2 + r2 − q + r − r + p − p + q

= p2 + q2 + r2

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