40.14.5 problem 26

Internal problem ID [6776]
Book : Schaums Outline. Theory and problems of Differential Equations, 1st edition. Frank Ayres. McGraw Hill 1952
Section : Chapter 19. Linear equations with variable coefficients (Misc. types). Supplemetary problems. Page 132
Problem number : 26
Date solved : Monday, January 27, 2025 at 02:30:16 PM
CAS classification : [[_2nd_order, _missing_x], [_2nd_order, _reducible, _mu_x_y1], [_2nd_order, _reducible, _mu_y_y1]]

\begin{align*} y y^{\prime \prime }+{y^{\prime }}^{3}&=0 \end{align*}

✓ Solution by Maple

Time used: 0.013 (sec). Leaf size: 27

dsolve(y(x)*diff(y(x),x$2)+diff(y(x),x)^3=0,y(x), singsol=all)
 

\begin{align*} y &= 0 \\ y &= c_1 \\ y &= \frac {x +c_2}{\operatorname {LambertW}\left (\left (x +c_2 \right ) {\mathrm e}^{c_1 -1}\right )} \\ \end{align*}

✓ Solution by Mathematica

Time used: 60.099 (sec). Leaf size: 26

DSolve[y[x]*D[y[x],{x,2}]+D[y[x],x]^3==0,y[x],x,IncludeSingularSolutions -> True]
 

\[ y(x)\to \frac {x+c_2}{W\left (e^{-1-c_1} (x+c_2)\right )} \]