Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 7 - Techniques of Integration - 7.4 Integration of Rational Functions by Partial Fractions - 7.4 Exercises - Page 541: 53

Answer

$\left(x-\frac{1}{2}\right)\ln(x^2-x+2)-2x+{\sqrt 7}\tan^{-1}\left(\frac{2x-1}{\sqrt 7}\right)+C$

Work Step by Step

$u$ = $\ln(x^2-x+2)$ $du$ = $\frac{2x-1}{x^2-x+2}dx$ Integrate by parts: $\int{\ln(x^2-x+2)}dx$ = $x\ln(x^2-x+2)-\int\frac{2x^2-x}{x^2-x+2}dx$ = $x\ln(x^2-x+2)-\int\left(2+\frac{x-4}{x^2-x+2}\right)dx$ = $x\ln(x^2-x+2)-2x-\int\left(\frac{\frac{1}{2}(2x-1)}{x^2-x+2}\right)dx+\frac{7}{2}\int\left(\frac{1}{(x-\frac{1}{2})^2+\frac{7}{4}}\right)dx$ = $x\ln(x^2-x+2)-2x-\frac{1}{2}\ln(x^2-x+2)+{\sqrt 7}\tan^{-1}\left(\frac{2x-1}{\sqrt 7}\right)+C$ = $\left(x-\frac{1}{2}\right)\ln(x^2-x+2)-2x+{\sqrt 7}\tan^{-1}\left(\frac{2x-1}{\sqrt 7}\right)+C$
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