1 dx = Jo 4+x

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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Evaluate the improper integral and use Lim.

1
dx =
4+x²
Transcribed Image Text:1 dx = 4+x²
Expert Solution
Step 1

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\int _0^{\infty }\:\frac{1}{4+x^2}dx

=\int _0^{\infty }\frac{1}{x^2+4}dx

=\int _0^{\infty }\frac{1}{4\left(\frac{1}{4}x^2+1\right)}dx

=\int _0^{\infty }\frac{1}{4\left(\left(\frac{x}{2}\right)^2+1\right)}dx

=\frac{1}{4}\int _0^{\infty }\frac{1}{\left(\frac{x}{2}\right)^2+1}dx..............(1)

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