83.32.8 problem 8

Internal problem ID [19407]
Book : A Text book for differentional equations for postgraduate students by Ray and Chaturvedi. First edition, 1958. BHASKAR press. INDIA
Section : Chapter VII. Exact differential equations and certain particular forms of equations. Exercise VII (F) at page 113
Problem number : 8
Date solved : Tuesday, January 28, 2025 at 01:38:34 PM
CAS classification : [[_2nd_order, _missing_x], [_2nd_order, _reducible, _mu_xy]]

\begin{align*} y^{\prime \prime }+{y^{\prime }}^{2}+1&=0 \end{align*}

✓ Solution by Maple

Time used: 0.011 (sec). Leaf size: 15

dsolve(diff(y(x),x$2)+diff(y(x),x)^2+1=0,y(x), singsol=all)
 

\[ y \left (x \right ) = \ln \left (c_{2} \cos \left (x \right )-c_{1} \sin \left (x \right )\right ) \]

✓ Solution by Mathematica

Time used: 1.759 (sec). Leaf size: 16

DSolve[D[y[x],{x,2}]+D[y[x],x]^2+1==0,y[x],x,IncludeSingularSolutions -> True]
 

\[ y(x)\to \log (\cos (x-c_1))+c_2 \]