x = var('x')
y=function('y',x)
DE = diff(y,x,2)+3*diff(y,x)-4*y-8*cos(2*x)-6*sin(2*x)
print "GS:", desolve(DE, [y,x])
#check for particular solution
yp = -cos(2*x)
V = diff(yp,x,2)+3*diff(yp,x)-4*yp-8*cos(2*x)-6*sin(2*x)
if V == 0:
    print "yp = ", yp, "is a particular solution"
else:
    print "yp = ", yp, "is not a particular solution"

SageDays/Kreyszig-2.8-5 (last edited 2010-08-11 12:07:51 by zubinmehta)