#Kreyszig Problem set 2.9 Question 18
var('x')
y=function('y',x)
print desolve(diff(y,x,2)+9*y==6*cos(3*x),[y,x],ics=[0,1,0])

SageDays/Kreyszig-2.9-18 (last edited 2010-08-11 12:16:36 by belindadcunha)