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

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{{{
#Kreyszig Problem set 2.9 Question 18
var('x')
y=function('y',x)
print desolve(diff(y,x,2)+9*y==6*cos(3*x),[y,x],ics=[0,1,0])}}}

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 * '''Solution by''': 
   * <Belinda D'Cunha>, <Lecturer>, <St.Francis Institute Of Technology>
   * <Your Name>, <Profession>, <Organization>