1.10 problem 10

Internal problem ID [7591]

Book: Differential Gleichungen, E. Kamke, 3rd ed. Chelsea Pub. NY, 1948
Section: Chapter 1, linear first order
Problem number: 10.
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [_linear]

Solve \begin {gather*} \boxed {y^{\prime }+f^{\prime }\relax (x ) y-f \relax (x ) f^{\prime }\relax (x )=0} \end {gather*}

Solution by Maple

Time used: 0.002 (sec). Leaf size: 15

dsolve(diff(y(x),x) + diff(f(x),x)*y(x) - f(x)*diff(f(x),x)=0,y(x), singsol=all)
 

\[ y \relax (x ) = f \relax (x )-1+{\mathrm e}^{-f \relax (x )} c_{1} \]

Solution by Mathematica

Time used: 0.048 (sec). Leaf size: 18

DSolve[y'[x] + f'[x]*y[x] - f[x]*f'[x]==0,y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to f(x)+c_1 e^{-f(x)}-1 \\ \end{align*}