[[_high_order, _quadrature]]
Book solution method
TO DO
Mathematica ✓
cpu = 0.00635236 (sec), leaf count = 22
Maple ✓
cpu = 0.006 (sec), leaf count = 21
DSolve[y''''[x] == 0,y[x],x]
Mathematica raw output
{{y[x] -> C[1] + x*(C[2] + x*(C[3] + x*C[4]))}}
Maple raw input
dsolve(diff(diff(diff(diff(y(x),x),x),x),x) = 0, y(x),'implicit')
Maple raw output
y(x) = 1/6*x^3*_C1+1/2*x^2*_C2+_C3*x+_C4