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simplify x (a (c - d) (x/k)^a)/(x ((x/k)^a + 1)^2) / (c+(d-c)/(1+((x/k)^a)))
simplify x (a (c - d) (x/k)^a)/(x ((x/k)^a + 1)^2) / (c+(d-c)/(1+((x/k)^a)))
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