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### Problem 1: 
You are asked to **find the limit** of the following expression:
\[
\lim_{x \to 3} \frac{x^2 - 9}{x - 3}
\]

This limit seems to be solvable using **factoring** and then applying direct substitution.

#### Solution:
First, factor the numerator:
\[
x^2 - 9 = (x - 3)(x + 3)
\]

Thus, the expression becomes:
\[
\frac{(x - 3)(x + 3)}{x - 3}
\]

For \(x \neq 3\), the \(x - 3\) terms cancel out, leaving:
\[
\lim_{x \to 3} (x + 3)
\]

Now, substituting \(x = 3\):
\[
3 + 3 = 6
\]

So, the limit is:
\[
\boxed{6}
\]

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### Problem 2:
You're tasked with identifying the **correct indefinite integral** for the given expression:
\[
\int \frac{\sin(3x)}{5e^{2x}} dx
\]

This is a standard **integration by parts** problem. But before solving, let's look at the possible answers and verify.

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Would you like me to proceed with solving the integration problem or confirm the correct answer from the options listed? Let me know if you'd like further details, or if any particular part needs more clarification. 

Here are 5 related questions to expand on this:

1. What is the general method for solving limits that result in an indeterminate form?
2. Can you explain the method of integration by parts in general terms?
3. How can we solve limits involving trigonometric functions?
4. What is L'Hôpital's Rule, and when is it applied in limits?
5. How do you approach problems where factoring is involved in limits?

#### Tip:
When evaluating limits and the direct substitution leads to 0/0, always look for opportunities to factor or simplify the expression.

Resuelve los problemas de cálculo de límites e integrales.

This webpage covers detailed solutions to calculus problems involving limits and integration by parts. Learn how to compute limits by factoring and handle complex integrals step by step.

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