#Kreyszig Problem set 2.9 Question 3
var('x')
y=function('y',x)
print desolve(diff(y,x,2)+3*diff(y,x)==28*cosh(4*x),[y,x])

SageDays/Kreyszig-2.9-3 (last edited 2010-08-11 12:22:57 by belindadcunha)