Internal
problem
ID
[9468]
Book
:
Differential
Gleichungen,
E.
Kamke,
3rd
ed.
Chelsea
Pub.
NY,
1948
Section
:
Chapter
1,
linear
first
order
Problem
number
:
489
Date
solved
:
Thursday, October 17, 2024 at 02:41:47 PM
CAS
classification
:
[_rational]
\begin{align*} y^{2} {y^{\prime }}^{2}+2 x y y^{\prime }+a y^{2}+b x +c&=0 \end{align*}
\begin{align*}
\tag{1} y^{\prime }&=\frac {-x +\sqrt {x^{2}-a y^{2}-b x -c}}{y} \\
\tag{2} y^{\prime }&=\frac {-x -\sqrt {x^{2}-a y^{2}-b x -c}}{y} \\
\end{align*}
Now each of the above is solved
separately.
\[ \begin {array}{lll} & {} & \textrm {Let's solve}\hspace {3pt} \\ {} & {} & y \left (x \right )^{2} \left (\frac {d}{d x}y \left (x \right )\right )^{2}+2 x y \left (x \right ) \left (\frac {d}{d x}y \left (x \right )\right )+a y \left (x \right )^{2}+b x +c =0 \\ \bullet & {} & \textrm {Highest derivative means the order of the ODE is}\hspace {3pt} 1 \\ {} & {} & \frac {d}{d x}y \left (x \right ) \\ \bullet & {} & \textrm {Solve for the highest derivative}\hspace {3pt} \\ {} & {} & \left [\frac {d}{d x}y \left (x \right )=\frac {-x -\sqrt {x^{2}-a y \left (x \right )^{2}-b x -c}}{y \left (x \right )}, \frac {d}{d x}y \left (x \right )=\frac {-x +\sqrt {x^{2}-a y \left (x \right )^{2}-b x -c}}{y \left (x \right )}\right ] \\ \bullet & {} & \textrm {Solve the equation}\hspace {3pt} \frac {d}{d x}y \left (x \right )=\frac {-x -\sqrt {x^{2}-a y \left (x \right )^{2}-b x -c}}{y \left (x \right )} \\ \bullet & {} & \textrm {Solve the equation}\hspace {3pt} \frac {d}{d x}y \left (x \right )=\frac {-x +\sqrt {x^{2}-a y \left (x \right )^{2}-b x -c}}{y \left (x \right )} \\ \bullet & {} & \textrm {Set of solutions}\hspace {3pt} \\ {} & {} & \left \{\mathit {workingODE} , \mathit {workingODE}\right \} \end {array} \]
1.486.3 Maple dsolve solution
Solving time : 1.053
(sec)
Leaf size : 363
dsolve(y(x)^2*diff(y(x),x)^2+2*y(x)*diff(y(x),x)*x+a*y(x)^2+b*x+c = 0,
y(x),singsol=all)
\begin{align*}
y &= -\frac {2 \sqrt {a \left (a \left (a x -\frac {1}{2} b +x \right )^{2} \left (a +1\right )^{2} \operatorname {RootOf}\left (-2 b \ln \left (2 a x -b +2 x \right )-b \left (\int _{}^{\textit {\_Z}}\frac {4 \textit {\_a} \,a^{2}+\sqrt {-{\mathrm e}^{\frac {4 a}{b}} {\mathrm e}^{\frac {4}{b}} \left (4 \textit {\_a} \,a^{3}+8 \textit {\_a} \,a^{2}+4 \textit {\_a} a -1\right )}\, {\mathrm e}^{-\frac {2 \left (a +1\right )}{b}}+8 \textit {\_a} a +4 \textit {\_a} +1}{\textit {\_a} \left (4 \textit {\_a} \,a^{2}+8 \textit {\_a} a +4 \textit {\_a} +a +2\right )}d \textit {\_a} \right )+4 c_{1} a +4 c_{1} \right )+\frac {\left (-b x -c \right ) a^{2}}{4}+\frac {\left (-\frac {b x}{2}-c \right ) a}{2}-\frac {b^{2}}{16}-\frac {c}{4}\right )}}{a \left (a +1\right )} \\
y &= \frac {2 \sqrt {a \left (a \left (a x -\frac {1}{2} b +x \right )^{2} \left (a +1\right )^{2} \operatorname {RootOf}\left (-2 b \ln \left (2 a x -b +2 x \right )-b \left (\int _{}^{\textit {\_Z}}\frac {4 \textit {\_a} \,a^{2}+\sqrt {-{\mathrm e}^{\frac {4 a}{b}} {\mathrm e}^{\frac {4}{b}} \left (4 \textit {\_a} \,a^{3}+8 \textit {\_a} \,a^{2}+4 \textit {\_a} a -1\right )}\, {\mathrm e}^{-\frac {2 \left (a +1\right )}{b}}+8 \textit {\_a} a +4 \textit {\_a} +1}{\textit {\_a} \left (4 \textit {\_a} \,a^{2}+8 \textit {\_a} a +4 \textit {\_a} +a +2\right )}d \textit {\_a} \right )+4 c_{1} a +4 c_{1} \right )+\frac {\left (-b x -c \right ) a^{2}}{4}+\frac {\left (-\frac {b x}{2}-c \right ) a}{2}-\frac {b^{2}}{16}-\frac {c}{4}\right )}}{a \left (a +1\right )} \\
\end{align*}
1.486.4 Mathematica DSolve solution
Solving time : 0.0
(sec)
Leaf size : 0
DSolve[{c + b*x + a*y[x]^2 + 2*x*y[x]*D[y[x],x] + y[x]^2*D[y[x],x]^2==0,{}},
y[x],x,IncludeSingularSolutions->True]
Timed out