x = var('x')
y=function('y',x)
DE = diff(y,x,2)-y-2*cos(x)
print "GS:", desolve(DE, [y,x], ics=[0,0,-0.2])
#check for particular solution
yp = -cos(x)
V = diff(yp,x,2)-yp-2*cos(x)
if V == 0:
    print "yp = ", yp, "is a particular solution"
else:
    print "yp = ", yp, "is not a particular solution"

SageDays/Kreyszig-2.8-10 (last edited 2010-08-11 12:55:39 by zubinmehta)