74.5.58 problem 63 (c)

Internal problem ID [16022]
Book : INTRODUCTORY DIFFERENTIAL EQUATIONS. Martha L. Abell, James P. Braselton. Fourth edition 2014. ElScAe. 2014
Section : Chapter 2. First Order Equations. Exercises 2.3, page 49
Problem number : 63 (c)
Date solved : Tuesday, January 28, 2025 at 08:26:46 AM
CAS classification : [[_linear, `class A`]]

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

With initial conditions

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

✓ Solution by Maple

Time used: 0.015 (sec). Leaf size: 19

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

\[ y = \frac {\cos \left (t \right )}{2}+\frac {\sin \left (t \right )}{2}-\frac {{\mathrm e}^{-t}}{2} \]

✓ Solution by Mathematica

Time used: 0.046 (sec). Leaf size: 26

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

\[ y(t)\to e^{-t} \int _0^te^{K[1]} \cos (K[1])dK[1] \]