20.3.7 problem Problem 7

Internal problem ID [3616]
Book : Differential equations and linear algebra, Stephen W. Goode and Scott A Annin. Fourth edition, 2015
Section : Chapter 1, First-Order Differential Equations. Section 1.6, First-Order Linear Differential Equations. page 59
Problem number : Problem 7
Date solved : Tuesday, March 04, 2025 at 04:54:58 PM
CAS classification : [_linear]

\begin{align*} 2 \cos \left (x \right )^{2} y^{\prime }+y \sin \left (2 x \right )&=4 \cos \left (x \right )^{4} \end{align*}

✓ Maple. Time used: 0.001 (sec). Leaf size: 13

ode:=2*cos(x)^2*diff(y(x),x)+y(x)*sin(2*x) = 4*cos(x)^4; 
dsolve(ode,y(x), singsol=all);
 

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

✓ Mathematica. Time used: 0.045 (sec). Leaf size: 15

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

\[ y(x)\to \cos (x) (2 \sin (x)+c_1) \]

✓ Sympy. Time used: 141.463 (sec). Leaf size: 12

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

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