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

/* code_begins */

{{{
t=var('t')
Y=function('Y',t)
DE = diff(diff(Y,t),t) + 2*diff(Y,t) + 4.*Y-sin(.2*t) 
de=desolve (DE,[Y,t])
DE0=diff(diff(Y,t),t) + 2*diff(Y,t) + 4.*Y
de0=desolve(DE0,[Y,t])
print 'Steady-state solution is'
show(de-de0)
}}}

/* code_ends */

 * '''Solution by''': 
   *Hardik Gajera,  Student,  IISER Pune
   *Lokesh Pimpale,  Student,  IISER Pune