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If $\lim _{x \rightarrow 0}\left(\frac{1+c x}{1-c x}\right)^{1 / x}=4$, then $\lim _{x \rightarrow 0}\left(\frac{1+2 c x}{1-2 c x}\right)^{1 / x}$ is
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The correct answer is:
16
Hint:
$\mathrm{e}^{2 \mathrm{c}}=4 \Rightarrow \mathrm{e}^{4 \mathrm{c}}=16$
$\mathrm{e}^{2 \mathrm{c}}=4 \Rightarrow \mathrm{e}^{4 \mathrm{c}}=16$
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