69.4.21 problem 86

Internal problem ID [18010]
Book : A book of problems in ordinary differential equations. M.L. KRASNOV, A.L. KISELYOV, G.I. MARKARENKO. MIR, MOSCOW. 1983
Section : Section 4. Equations with variables separable and equations reducible to them. Exercises page 38
Problem number : 86
Date solved : Thursday, October 02, 2025 at 02:33:19 PM
CAS classification : [_quadrature]

\begin{align*} {\mathrm e}^{y^{\prime }}&=1 \end{align*}

✓ Maple. Time used: 0.002 (sec). Leaf size: 5

ode:=exp(diff(y(x),x)) = 1; 
dsolve(ode,y(x), singsol=all);
 

\[ y = c_1 \]

✓ Mathematica. Time used: 0.002 (sec). Leaf size: 7

ode=Exp[D[y[x],x]]==1; 
ic={}; 
DSolve[{ode,ic},y[x],x,IncludeSingularSolutions->True]
 

\begin{align*} y(x)&\to c_1 \end{align*}

✓ Sympy. Time used: 0.055 (sec). Leaf size: 3

from sympy import * 
x = symbols("x") 
y = Function("y") 
ode = Eq(exp(Derivative(y(x), x)) - 1,0) 
ics = {} 
dsolve(ode,func=y(x),ics=ics)
 

\[ y{\left (x \right )} = C_{1} \]