28.1.64 problem 65

Internal problem ID [4370]
Book : Differential equations for engineers by Wei-Chau XIE, Cambridge Press 2010
Section : Chapter 2. First-Order and Simple Higher-Order Differential Equations. Page 78
Problem number : 65
Date solved : Tuesday, March 04, 2025 at 06:33:21 PM
CAS classification : [_linear]

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

✓ Maple. Time used: 0.019 (sec). Leaf size: 16

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

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

✓ Mathematica. Time used: 0.086 (sec). Leaf size: 24

ode=(1+Cos[x])*D[y[x],x]==Sin[x]*( Sin[x]+Sin[x]*Cos[x]-y[x] ); 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\[ y(x)\to \cos ^2\left (\frac {x}{2}\right ) (2 x-2 \sin (x)+c_1) \]

✓ Sympy. Time used: 128.492 (sec). Leaf size: 42

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

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