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

/* code_begins */

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

/* code_ends */

 * '''Solution by''': 
   * Indana Ravi Shankar, student, Pydah college of engg, vizag