#2.13-6
x=var('x')
y=function('y',x)
de=diff(y,x,2)+diff(y,x,1)+y==cos(x)+13*cos(2*x)
desolve(de,y)

SageDays/Kreyszig-2.13-6 (last edited 2010-08-12 10:11:48 by satishbillade)