Question: Multiply or divide and, if possible, simplify. (a) r - s / r + s r2 - s2 / (r - s)2 (b) x2

Multiply or divide and, if possible, simplify.
(a) r - s / r + s ∙ r2 - s2 / (r - s)2
(b) x2 - y2 / (x - y)2 ∙ 1 / x + y
(c) x2 + 2x - 35 / 2x3 - 3x2 ∙ 4x3 - 93x / 7x - 49

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