73.11.31 problem 17.6 (a)

Internal problem ID [15345]
Book : Ordinary Differential Equations. An introduction to the fundamentals. Kenneth B. Howell. second edition. CRC Press. FL, USA. 2020
Section : Chapter 17. Second order Homogeneous equations with constant coefficients. Additional exercises page 334
Problem number : 17.6 (a)
Date solved : Tuesday, January 28, 2025 at 07:53:18 AM
CAS classification : [[_2nd_order, _missing_x]]

\begin{align*} y^{\prime \prime }+16 y&=0 \end{align*}

With initial conditions

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

✓ Solution by Maple

Time used: 0.009 (sec). Leaf size: 8

dsolve([diff(y(x),x$2)+16*y(x)=0,y(0) = 1, D(y)(0) = 0],y(x), singsol=all)
 

\[ y = \cos \left (4 x \right ) \]

✓ Solution by Mathematica

Time used: 0.014 (sec). Leaf size: 9

DSolve[{D[y[x],{x,2}]+16*y[x]==0,{y[0]==1,Derivative[1][y][0] ==0}},y[x],x,IncludeSingularSolutions -> True]
 

\[ y(x)\to \cos (4 x) \]