78.14.10 problem 4 (b)

Internal problem ID [18346]
Book : DIFFERENTIAL EQUATIONS WITH APPLICATIONS AND HISTORICAL NOTES by George F. Simmons. 3rd edition. 2017. CRC press, Boca Raton FL.
Section : Chapter 3. Second order linear equations. Section 19. The Method of Variation of Parameters. Problems at page 135
Problem number : 4 (b)
Date solved : Tuesday, January 28, 2025 at 11:47:50 AM
CAS classification : [[_2nd_order, _linear, _nonhomogeneous]]

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

✓ Solution by Maple

Time used: 0.002 (sec). Leaf size: 26

dsolve(diff(y(x),x$2)+y(x)=cot(x)^2,y(x), singsol=all)
 

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

✓ Solution by Mathematica

Time used: 0.057 (sec). Leaf size: 34

DSolve[D[y[x],{x,2}] +y[x]==Cot[x]^2,y[x],x,IncludeSingularSolutions -> True]
 

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