Internal problem ID [1494]
Book: Elementary differential equations with boundary value problems. William F. Trench.
Brooks/Cole 2001
Section: Chapter 9 Introduction to Linear Higher Order Equations. Section 9.2. constant
coefficient. Page 483
Problem number: section 9.2, problem 43(c).
ODE order: 4.
ODE degree: 1.
CAS Maple gives this as type [[_high_order, _missing_x]]
\[ \boxed {y^{\prime \prime \prime \prime }+64 y=0} \]
✓ Solution by Maple
Time used: 0.0 (sec). Leaf size: 41
dsolve(diff(y(x),x$4)+64*y(x)=0,y(x), singsol=all)
\[ y \left (x \right ) = \left (c_{2} {\mathrm e}^{2 x}+c_{4} {\mathrm e}^{-2 x}\right ) \cos \left (2 x \right )+\sin \left (2 x \right ) \left (c_{1} {\mathrm e}^{2 x}+c_{3} {\mathrm e}^{-2 x}\right ) \]
✓ Solution by Mathematica
Time used: 0.003 (sec). Leaf size: 44
DSolve[y''''[x]+64*y[x]==0,y[x],x,IncludeSingularSolutions -> True]
\[ y(x)\to e^{-2 x} \left (\left (c_4 e^{4 x}+c_1\right ) \cos (2 x)+\left (c_3 e^{4 x}+c_2\right ) \sin (2 x)\right ) \]