23.5.159 problem 159

Internal problem ID [6768]
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 : 159
Date solved : Tuesday, September 30, 2025 at 03:51:30 PM
CAS classification : [[_high_order, _missing_x]]

\begin{align*} 16 y-16 y^{\prime }+12 y^{\prime \prime }-4 y^{\prime \prime \prime }+y^{\prime \prime \prime \prime }&=0 \end{align*}

✓ Maple. Time used: 0.001 (sec). Leaf size: 32

ode:=16*y(x)-16*diff(y(x),x)+12*diff(diff(y(x),x),x)-4*diff(diff(diff(y(x),x),x),x)+diff(diff(diff(diff(y(x),x),x),x),x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = \left (\left (c_4 x +c_2 \right ) \cos \left (\sqrt {3}\, x \right )+\sin \left (\sqrt {3}\, x \right ) \left (c_3 x +c_1 \right )\right ) {\mathrm e}^{x} \]

✓ Mathematica. Time used: 0.003 (sec). Leaf size: 42

ode=16*y[x] - 16*D[y[x],x] + 12*D[y[x],{x,2}] - 4*D[y[x],{x,3}] + D[y[x],{x,4}] == 0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to e^x \left ((c_4 x+c_3) \cos \left (\sqrt {3} x\right )+(c_2 x+c_1) \sin \left (\sqrt {3} x\right )\right ) \end{align*}

✓ Sympy. Time used: 0.142 (sec). Leaf size: 32

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(16*y(x) - 16*Derivative(y(x), x) + 12*Derivative(y(x), (x, 2)) - 4*Derivative(y(x), (x, 3)) + Derivative(y(x), (x, 4)),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

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