If p = a^2/(b - a)(c - a), q = b^2/(c - b)(a - b), r = c^2/(a - c)(b - c), then what is (p + q + r)^2 equal to ? - CDS Elementary Mathematics 2023 (II)

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If p = a^2/(b – a)(c – a), q = b^2/(c – b)(a – b), r = c^2/(a – c)(b – c), then what is (p + q + r)^2 equal to ?