#2.4-1
x=var('x')
y=function('y',x)
y=e^(-x)+e^(2*x)
de=diff(y,x,2)+3*diff(y,x,1)
print de

SageDays/Kreyszig-2.4-1 (last edited 2010-08-11 13:22:48 by shambulingayya.N.D)