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what's the nth derivative of $-\frac{5}{x-1} - \frac{9}{(x-1)^2} - \frac{6}{(x-1)^3} - 1$
what's the nth derivative of $-\frac{5}{x-1} - \frac{9}{(x-1)^2} - \frac{6}{(x-1)^3} - 1$
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