Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 1 - First-Order Differential Equations - 1.2 Basic Ideas and Terminology - Problems - Page 22: 32

Answer

\[y=\frac{\sqrt{1+\sin x}}{x}\]

Work Step by Step

$x^2y^2-\sin x=c$ ______(1) Differentiate (1) with respect to $x$ treating $y$ as function of $x$ \[2xy^2+2x^2y\frac{dy}{dx}-\cos x=0\] \[\frac{dy}{dx}=\frac{\cos x-2xy^2}{2x^2y}\] Hence (1) ia implict solution of the differential equation $y'=\frac{\cos x-2xy^2}{2x^2y}$ $\circ y(π)=\frac{1}{π}$ _____(2) Using (2) in (1) $\frac{π^2}{π^2}-\sin π =c$ $\Rightarrow$ $c=1$ From (1) \[x^2y^2-\sin x=1\] \[y=\frac{\sqrt{1+\sin x}}{x}\] Hence explicit solution that satisfies $y(π)=\frac{1}{π}$ is $y=\frac{\sqrt{1+\sin x}}{x}$
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