2.13 problem 2(c)

Internal problem ID [5398]

Book: Differential Equations: Theory, Technique, and Practice by George Simmons, Steven Krantz. McGraw-Hill NY. 2007. 1st Edition.
Section: Chapter 1. What is a differential equation. Section 1.3 SEPARABLE EQUATIONS. Page 12
Problem number: 2(c).
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [_separable]

Solve \begin {gather*} \boxed {\frac {y^{\prime }}{x^{2}+1}-\frac {x}{y}=0} \end {gather*} With initial conditions \begin {align*} [y \relax (1) = 3] \end {align*}

Solution by Maple

Time used: 0.047 (sec). Leaf size: 20

dsolve([diff(y(x),x)/(1+x^2)=x/y(x),y(1) = 3],y(x), singsol=all)
 

\[ y \relax (x ) = \frac {\sqrt {2 x^{4}+4 x^{2}+30}}{2} \]

Solution by Mathematica

Time used: 0.148 (sec). Leaf size: 25

DSolve[{y'[x]/(1+x^2)==x/y[x],{y[1]==3}},y[x],x,IncludeSingularSolutions -> True]
 

\begin{align*} y(x)\to \frac {\sqrt {x^4+2 x^2+15}}{\sqrt {2}} \\ \end{align*}