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Let f : R toR " be a real function. The ...

`Let f : R toR " be a real function. The function "f" is double differentiable. If there exists "ninN" and "p inR" such that "lim_(x to oo)x^(n)f(x)=p" and there exists "lim_(x to oo)x^(n+1)f(x), "then"`
`lim_(x to oo)x^(n+1)f'(x)` is equal to

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