Provide example limit equations for exponential and logarithmic functions.
Understand the Problem
The user is asking for example limit equations involving exponential and logarithmic functions. I will provide a couple of standard examples.
Answer
$$ \lim_{x \to 0} \frac{e^x - 1}{x} = 1 $$ $$ \lim_{x \to 0} \frac{\ln(1+x)}{x} = 1 $$
Answer for screen readers
Example 1: $$ \lim_{x \to 0} \frac{e^x - 1}{x} = 1 $$
Example 2: $$ \lim_{x \to 0} \frac{\ln(1+x)}{x} = 1 $$
Steps to Solve
- Example 1: Limit involving exponential function
Here's a limit problem involving an exponential function. $$ \lim_{x \to 0} \frac{e^x - 1}{x} $$
- Solve Example 1
This limit is a standard result and can be solved using L'Hôpital's rule or by recognizing it as the derivative of $e^x$ at $x=0$. Applying L'Hôpital's rule:
Since the limit is in the indeterminate form $\frac{0}{0}$, we differentiate the numerator and the denominator with respect to $x$. $$ \lim_{x \to 0} \frac{\frac{d}{dx}(e^x - 1)}{\frac{d}{dx}(x)} = \lim_{x \to 0} \frac{e^x}{1} $$ Now, we can directly evaluate the limit by substituting $x = 0$: $$ \lim_{x \to 0} e^x = e^0 = 1 $$
- Example 2: Limit involving logarithmic function
Consider the following limit involving a logarithmic function: $$ \lim_{x \to 0} \frac{\ln(1+x)}{x} $$
- Solve Example 2
This limit is also a standard result. Similar to the previous example, we can use L'Hôpital's rule or recognize it as the derivative of $\ln(1+x)$ at $x=0$. Applying L'Hôpital's rule:
Since the limit is in the indeterminate form $\frac{0}{0}$, we differentiate the numerator and the denominator with respect to $x$. $$ \lim_{x \to 0} \frac{\frac{d}{dx}(\ln(1+x))}{\frac{d}{dx}(x)} = \lim_{x \to 0} \frac{\frac{1}{1+x}}{1} $$ Now, we can directly evaluate the limit by substituting $x = 0$: $$ \lim_{x \to 0} \frac{1}{1+x} = \frac{1}{1+0} = 1 $$
Example 1: $$ \lim_{x \to 0} \frac{e^x - 1}{x} = 1 $$
Example 2: $$ \lim_{x \to 0} \frac{\ln(1+x)}{x} = 1 $$
More Information
These limits are fundamental and appear frequently in calculus. Understanding them helps in evaluating more complex limits.
Tips
A common mistake is to incorrectly apply L'Hôpital's rule when the limit is not in an indeterminate form (e.g. $\frac{0}{0}$ or $\frac{\infty}{\infty}$). Always check the form of the limit before applying the rule.
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