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

/* code_begins */

{{{
x = var('x')
y = function('y',x)
deq1 = diff(y,x,3)+9*diff(y,x,2)+27*diff(y,x,1)+27*y==0
soln = desolve_laplace(deq1 ,  [y,x])
soln
}}}

/* code_ends */

 * '''Solution by''': 
   * k.k.sairam phani, student, ASR college of engg, Tanuku, A.P.