77.2.9 problem 9

Internal problem ID [20340]
Book : A Text book for differentional equations for postgraduate students by Ray and Chaturvedi. First edition, 1958. BHASKAR press. INDIA
Section : Chapter II. Equations of first order and first degree. Exercise II (A) at page 8
Problem number : 9
Date solved : Thursday, October 02, 2025 at 05:44:13 PM
CAS classification : [_linear]

\begin{align*} x y^{\prime }-y-\cos \left (\frac {1}{x}\right )&=0 \end{align*}

✓ Maple. Time used: 0.001 (sec). Leaf size: 14

ode:=x*diff(y(x),x)-y(x)-cos(1/x) = 0; 
dsolve(ode,y(x), singsol=all);
 

\[ y = \left (-\sin \left (\frac {1}{x}\right )+c_1 \right ) x \]

✓ Mathematica. Time used: 0.022 (sec). Leaf size: 16

ode=x*D[y[x],x]-y[x]-Cos[1/x]==0; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to x \left (-\sin \left (\frac {1}{x}\right )+c_1\right ) \end{align*}

✓ Sympy. Time used: 0.212 (sec). Leaf size: 10

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(x*Derivative(y(x), x) - y(x) - cos(1/x),0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = x \left (C_{1} - \sin {\left (\frac {1}{x} \right )}\right ) \]