(A) b – rd)²/(r – s)
(B) b – rd)²/(r + s)
(C) ½ × (b + rd)²/(r – s)
(D) b – rd)²/(s – r)
(A) b – rd)²/(r – s)
(B) b – rd)²/(r + s)
(C) ½ × (b + rd)²/(r – s)
(D) b – rd)²/(s – r)
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