74.4.57 problem 57 (a)

Internal problem ID [15950]
Book : INTRODUCTORY DIFFERENTIAL EQUATIONS. Martha L. Abell, James P. Braselton. Fourth edition 2014. ElScAe. 2014
Section : Chapter 2. First Order Equations. Exercises 2.2, page 39
Problem number : 57 (a)
Date solved : Tuesday, January 28, 2025 at 08:24:24 AM
CAS classification : [_separable]

\begin{align*} y^{\prime }&=y \cos \left (t \right ) \end{align*}

With initial conditions

\begin{align*} y \left (0\right )&=1 \end{align*}

✓ Solution by Maple

Time used: 0.010 (sec). Leaf size: 7

dsolve([diff(y(t),t)=y(t)*cos(t),y(0) = 1],y(t), singsol=all)
 

\[ y = {\mathrm e}^{\sin \left (t \right )} \]

✓ Solution by Mathematica

Time used: 0.029 (sec). Leaf size: 17

DSolve[{D[y[t],t]==y[t]*Cos[t],{y[0]==1}},y[t],t,IncludeSingularSolutions -> True]
 

\[ y(t)\to \exp \left (\int _0^t\cos (K[1])dK[1]\right ) \]