Internal problem ID [5846]
Book: THEORY OF DIFFERENTIAL EQUATIONS IN ENGINEERING AND MECHANICS.
K.T. CHAU, CRC Press. Boca Raton, FL. 2018
Section: Chapter 3. Ordinary Differential Equations. Section 3.2 FIRST ORDER ODE. Page
114
Problem number: Example 3.14.
ODE order: 1.
ODE degree: 2.
CAS Maple gives this as type [_dAlembert]
\[ \boxed {y^{\prime } y-a {y^{\prime }}^{2}=-x} \]
✓ Solution by Maple
Time used: 0.063 (sec). Leaf size: 246
dsolve(x+y(x)*diff(y(x),x)=a*(diff(y(x),x))^2,y(x), singsol=all)
\begin{align*} \frac {-\frac {\sqrt {2}\, \left (y \left (x \right )+\sqrt {4 a x +y \left (x \right )^{2}}\right ) \operatorname {arcsinh}\left (\frac {y \left (x \right )+\sqrt {4 a x +y \left (x \right )^{2}}}{2 a}\right )}{2}+x \sqrt {\frac {y \left (x \right ) \sqrt {4 a x +y \left (x \right )^{2}}+2 a^{2}+2 a x +y \left (x \right )^{2}}{a^{2}}}+c_{1} y \left (x \right )+c_{1} \sqrt {4 a x +y \left (x \right )^{2}}}{\sqrt {\frac {y \left (x \right ) \sqrt {4 a x +y \left (x \right )^{2}}+y \left (x \right )^{2}+2 a \left (a +x \right )}{a^{2}}}} &= 0 \\ \frac {\sqrt {\frac {-2 y \left (x \right ) \sqrt {4 a x +y \left (x \right )^{2}}+2 y \left (x \right )^{2}+4 a \left (a +x \right )}{a^{2}}}\, x -\left (y \left (x \right )-\sqrt {4 a x +y \left (x \right )^{2}}\right ) \left (-\operatorname {arcsinh}\left (\frac {-y \left (x \right )+\sqrt {4 a x +y \left (x \right )^{2}}}{2 a}\right )+c_{1} \right )}{\sqrt {\frac {-2 y \left (x \right ) \sqrt {4 a x +y \left (x \right )^{2}}+2 y \left (x \right )^{2}+4 a \left (a +x \right )}{a^{2}}}} &= 0 \\ \end{align*}
✓ Solution by Mathematica
Time used: 1.371 (sec). Leaf size: 71
DSolve[x+y[x]*y'[x]==a*(y'[x])^2,y[x],x,IncludeSingularSolutions -> True]
\[ \text {Solve}\left [\left \{x=-\frac {a K[1] \log \left (\sqrt {K[1]^2+1}-K[1]\right )}{\sqrt {K[1]^2+1}}+\frac {c_1 K[1]}{\sqrt {K[1]^2+1}},y(x)=a K[1]-\frac {x}{K[1]}\right \},\{y(x),K[1]\}\right ] \]