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Limits of Exponential and Logarithmic Functions

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Formula: Exponential and Logarithmic Functions

1. \[\lim_{x\to0}\left(\frac{e^{x}-1}{x}\right)=\log e=1\]

2. \[\lim_{x\to0}\left(\frac{a^{x}-1}{x}\right)=\log a(a>0,a\neq1)\]

3. \[\lim_{x\to0}(1+x)^{\frac{1}{x}}=e=\lim_{x\to\infty}\left(1+\frac{1}{x}\right)^{x}\]

4. \[\lim_{x\to0}\left(\frac{\log\left(1+x\right)}{x}\right)=1\]

5. \[\lim_{x\to0}\left(\frac{e^{px}-1}{px}\right)=1,\] (p constant)

6. \[\lim_{x\to0}\left(\frac{a^{px}-1}{px}\right)=\log a,\] (p constant)

7. \[\lim_{x\to\infty}a^{x}= \begin{cases} 0 & , & \mathrm{if}-1<a<1 \\ 1 & , & \mathrm{if}a=1 \\ \infty & , & \mathrm{if}a>1 & \end{cases}\]

8. \[\lim_{x\to0}\frac{\log\left(1+\mathrm{k}x\right)}{x}=\mathrm{k},\mathrm{k}\in\mathrm{R}\]

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