dx (x+1)(x² +1) 0.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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How did we integrate this? The answer key left out any u subs or other techniques we may have used to integrate. Could you show what is missing?

Certainly! Here is a transcription of the image, designed to be suitable for an educational website:

---

**c)**  
\[
\int_{0}^{b} \frac{dx}{(x^2 + 1)(x^2 + 4)} = \lim_{b \to \infty} \left[ \frac{1}{3} \ln x + \frac{1}{3} \ln (x^2 + 1) + \frac{1}{6} \tan^{-1} x \right]_{0}^{b} = \lim_{b \to \infty} \left[ \frac{1}{3} \ln \left(\frac{x(x^2 + 1)}{1}\right) + \frac{1}{6} \tan^{-1} x \right]_{0}^{b} 
\]

\[
= \lim_{b \to \infty} \left[ \frac{1}{3} \ln \left(\frac{x(x^2 + 1)}{1}\right) + \frac{1}{6} \tan^{-1} b \right] - \frac{1}{3} \ln 1 + \frac{1}{6} \tan^{-1} 0 = \frac{1}{3} \ln 1 - \frac{1}{6} \ln 1 + 0 = \frac{1}{6}
\]

**3.** Write out the first five terms of the sequence, determine whether the sequence converges.

---

No graphs or diagrams were present in the image.
Transcribed Image Text:Certainly! Here is a transcription of the image, designed to be suitable for an educational website: --- **c)** \[ \int_{0}^{b} \frac{dx}{(x^2 + 1)(x^2 + 4)} = \lim_{b \to \infty} \left[ \frac{1}{3} \ln x + \frac{1}{3} \ln (x^2 + 1) + \frac{1}{6} \tan^{-1} x \right]_{0}^{b} = \lim_{b \to \infty} \left[ \frac{1}{3} \ln \left(\frac{x(x^2 + 1)}{1}\right) + \frac{1}{6} \tan^{-1} x \right]_{0}^{b} \] \[ = \lim_{b \to \infty} \left[ \frac{1}{3} \ln \left(\frac{x(x^2 + 1)}{1}\right) + \frac{1}{6} \tan^{-1} b \right] - \frac{1}{3} \ln 1 + \frac{1}{6} \tan^{-1} 0 = \frac{1}{3} \ln 1 - \frac{1}{6} \ln 1 + 0 = \frac{1}{6} \] **3.** Write out the first five terms of the sequence, determine whether the sequence converges. --- No graphs or diagrams were present in the image.
### Calculus Problem: Evaluation of an Improper Integral

The problem involves evaluating the following definite integral:

\[
c) \int_{0}^{\infty} \frac{dx}{(x+1)(x^2+1)}
\]

#### Explanation:

This is an improper integral because one of its limits of integration is infinity. To solve this, we typically use techniques such as partial fraction decomposition to break the integrand into simpler fractions that can be integrated individually.

#### Steps for Solving:

1. **Partial Fraction Decomposition**:
   - Express the integrand \(\frac{1}{(x+1)(x^2+1)}\) as a sum of simpler fractions.
   - Assume a decomposition of the form:
     \[
     \frac{A}{x+1} + \frac{Bx+C}{x^2+1}
     \]
   - Solve for constants \(A\), \(B\), and \(C\).

2. **Integration**:
   - Integrate each term resulting from the decomposition over the interval from 0 to \(\infty\).
   - Use limits to properly evaluate the terms involving infinity.

3. **Combine Results**:
   - Sum the results of the integrals to find the overall solution.

This problem is a common exercise in calculus courses to enhance skills in handling improper integrals and applying partial fraction decomposition.
Transcribed Image Text:### Calculus Problem: Evaluation of an Improper Integral The problem involves evaluating the following definite integral: \[ c) \int_{0}^{\infty} \frac{dx}{(x+1)(x^2+1)} \] #### Explanation: This is an improper integral because one of its limits of integration is infinity. To solve this, we typically use techniques such as partial fraction decomposition to break the integrand into simpler fractions that can be integrated individually. #### Steps for Solving: 1. **Partial Fraction Decomposition**: - Express the integrand \(\frac{1}{(x+1)(x^2+1)}\) as a sum of simpler fractions. - Assume a decomposition of the form: \[ \frac{A}{x+1} + \frac{Bx+C}{x^2+1} \] - Solve for constants \(A\), \(B\), and \(C\). 2. **Integration**: - Integrate each term resulting from the decomposition over the interval from 0 to \(\infty\). - Use limits to properly evaluate the terms involving infinity. 3. **Combine Results**: - Sum the results of the integrals to find the overall solution. This problem is a common exercise in calculus courses to enhance skills in handling improper integrals and applying partial fraction decomposition.
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