1.9 problem 12

Internal problem ID [12553]

Book: DIFFERENTIAL EQUATIONS by Paul Blanchard, Robert L. Devaney, Glen R. Hall. 4th edition. Brooks/Cole. Boston, USA. 2012
Section: Chapter 1. First-Order Differential Equations. Exercises section 1.2. page 33
Problem number: 12.
ODE order: 1.
ODE degree: 1.

CAS Maple gives this as type [_separable]

\[ \boxed {y^{\prime }-\frac {t}{y}=0} \]

Solution by Maple

Time used: 0.0 (sec). Leaf size: 23

dsolve(diff(y(t),t)=t/y(t),y(t), singsol=all)
 

\begin{align*} y \left (t \right ) = \sqrt {t^{2}+c_{1}} y \left (t \right ) = -\sqrt {t^{2}+c_{1}} \end{align*}

Solution by Mathematica

Time used: 0.14 (sec). Leaf size: 35

DSolve[y'[t]==t/y[t],y[t],t,IncludeSingularSolutions -> True]
 

\begin{align*} y(t)\to -\sqrt {t^2+2 c_1} y(t)\to \sqrt {t^2+2 c_1} \end{align*}