Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 6 - Differential Equations - 6.3 Exercises - Page 421: 18



Work Step by Step

$2xy'-\ln{x^2}=0$ $y'=\frac{\ln{x^2}}{2x}$ $\frac{dy}{dx}=\frac{\ln{x^2}}{2x}$ $dy=\frac{\ln{x^2}}{2x}dx$ $\int{dy}=\int{\frac{\ln{x^2}}{2x}dx}$ Let $u=\ln{x^2}$ and $du=\frac{2x}{x^2}=\frac{2}{x}$. $y=\frac{1}{4}\int{\frac{2\ln{x^2}}{x}dx}$ $y=\frac{1}{4}\int{udu}$ $y=\frac{1}{8}u^2+C$ $y=\frac{1}{8}(\ln{x^2})^2+C$ Using the initial condition $y(1)=2$: $2=\frac{1}{8}(\ln{1^2})^2+C$ $2=C$ $y=\frac{1}{8}(\ln{x^2})^2+2$
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