add p(p_q) q(q_r) and r(r_p)
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- p(p - q) + q(q - r) + r(r - p)
- p² - pq + q² - qr + r² - rp
- p² + q² + r² - pq - qr - rp
→ (a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca
- a² + b² + c² + 2(ab + bc + ca)
→ (p + q + r)² = p² + q² + r² + 2 ( pq + qr + rp )
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