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Differentiable

Calculus Level 2

$f(x)$ is a function differentiable at $x=1,$ and $f'(1)=\frac{1}{5}$ . What is the value of $\displaystyle \lim_{x \to 1} \frac{x^3-1}{f(x)-f(1)}?$

10

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15

5

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by Ajay Dutta

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