23.5.134 problem 134

Internal problem ID [6743]
Book : Ordinary differential equations and their solutions. By George Moseley Murphy. 1960
Section : Part II. Chapter 5. THE EQUATION IS LINEAR AND OF ORDER GREATER THAN TWO, page 410
Problem number : 134
Date solved : Tuesday, September 30, 2025 at 03:51:19 PM
CAS classification : [[_high_order, _missing_x]]

\begin{align*} y+2 y^{\prime \prime }+y^{\prime \prime \prime \prime }&=0 \end{align*}

✓ Maple. Time used: 0.000 (sec). Leaf size: 21

ode:=y(x)+2*diff(diff(y(x),x),x)+diff(diff(diff(diff(y(x),x),x),x),x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = \left (c_4 x +c_2 \right ) \cos \left (x \right )+\sin \left (x \right ) \left (c_3 x +c_1 \right ) \]

✓ Mathematica. Time used: 0.002 (sec). Leaf size: 26

ode=y[x] + 2*D[y[x],{x,2}] + D[y[x],{x,4}] == 0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to (c_2 x+c_1) \cos (x)+(c_4 x+c_3) \sin (x) \end{align*}

✓ Sympy. Time used: 0.055 (sec). Leaf size: 19

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(y(x) + 2*Derivative(y(x), (x, 2)) + Derivative(y(x), (x, 4)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = \left (C_{1} + C_{2} x\right ) \sin {\left (x \right )} + \left (C_{3} + C_{4} x\right ) \cos {\left (x \right )} \]