20.12.11 problem Problem 30

Internal problem ID [3805]
Book : Differential equations and linear algebra, Stephen W. Goode and Scott A Annin. Fourth edition, 2015
Section : Chapter 8, Linear differential equations of order n. Section 8.10, Chapter review. page 575
Problem number : Problem 30
Date solved : Monday, January 27, 2025 at 08:02:35 AM
CAS classification : [[_2nd_order, _linear, _nonhomogeneous]]

\begin{align*} y^{\prime \prime }+y x&=\sin \left (x \right ) \end{align*}

✓ Solution by Maple

Time used: 0.039 (sec). Leaf size: 48

dsolve(diff(y(x),x$2)+x*y(x)=sin(x),y(x), singsol=all)
 

\[ y \left (x \right ) = \pi \left (\int \operatorname {AiryBi}\left (-x \right ) \sin \left (x \right )d x \right ) \operatorname {AiryAi}\left (-x \right )-\pi \left (\int \operatorname {AiryAi}\left (-x \right ) \sin \left (x \right )d x \right ) \operatorname {AiryBi}\left (-x \right )+\operatorname {AiryAi}\left (-x \right ) c_{2} +\operatorname {AiryBi}\left (-x \right ) c_{1} \]

✓ Solution by Mathematica

Time used: 100.706 (sec). Leaf size: 99

DSolve[D[y[x],{x,2}]+x*y[x]==Sin[x],y[x],x,IncludeSingularSolutions -> True]
 

\[ y(x)\to \operatorname {AiryAi}\left (\sqrt [3]{-1} x\right ) \int _1^x(-1)^{2/3} \pi \operatorname {AiryBi}\left (\sqrt [3]{-1} K[1]\right ) \sin (K[1])dK[1]+\operatorname {AiryBi}\left (\sqrt [3]{-1} x\right ) \int _1^x-(-1)^{2/3} \pi \operatorname {AiryAi}\left (\sqrt [3]{-1} K[2]\right ) \sin (K[2])dK[2]+c_1 \operatorname {AiryAi}\left (\sqrt [3]{-1} x\right )+c_2 \operatorname {AiryBi}\left (\sqrt [3]{-1} x\right ) \]