||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
x=var('x') #declaring Variable
y=e^-x+e^2*x  
DE=diff(y,x,2)+3*diff(y,x,1) # Equation
print DE #Displaying Result

}}}

/* code_ends */

 * '''Solution by''': 
   * Mahesh Goheja , Diploma Student, Pravara Polytechnic-Loni 413637