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

/* code_begins */

{{{
x,y=var('x,y')
w=x*x-y*y
w1=diff(w,x,2)
w2=diff(w,y,2)
w3=w1+w2
a=integrate(w3,(x,0,1))
p=integrate(a,(y,0,1))
}}}

/* code_ends */

 * '''Solution by''': 
   * triveni.k,student,pec
   * srija.n,student,pec
   * sivalatha.k,student,pec