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\begin{array}{l}{\text { 4. Starting from } \lim _{x \rightarrow a} \frac{x^{n}-a^{n}}{x-a}=n a^{n-1} \text { deduce }} \\ {\lim _{x \rightarrow 0} \frac{(1+x)^{n}-1}{x}=n}\end{array} |
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