35.6.17 problem 17

Internal problem ID [6167]
Book : Mathematical Methods in the Physical Sciences. third edition. Mary L. Boas. John Wiley. 2006
Section : Chapter 8, Ordinary differential equations. Section 6. SECOND-ORDER LINEAR EQUATIONSWITH CONSTANT COEFFICIENTS AND RIGHT-HAND SIDE NOT ZERO. page 422
Problem number : 17
Date solved : Sunday, March 30, 2025 at 10:41:47 AM
CAS classification : [[_2nd_order, _linear, _nonhomogeneous]]

\begin{align*} y^{\prime \prime }+16 y&=16 \cos \left (4 x \right ) \end{align*}

✓ Maple. Time used: 0.002 (sec). Leaf size: 29

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

\[ y = \frac {\left (2 c_2 +4 x \right ) \sin \left (4 x \right )}{2}+\frac {\left (2 c_1 +1\right ) \cos \left (4 x \right )}{2} \]

✓ Mathematica. Time used: 0.101 (sec). Leaf size: 28

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

\[ y(x)\to \left (\frac {1}{4}+c_1\right ) \cos (4 x)+(2 x+c_2) \sin (4 x) \]

✓ Sympy. Time used: 0.088 (sec). Leaf size: 19

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

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