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

/* code_begins */

{{{
var('x,y,z')
z=x+y*I
f=(z^4+1/z^4)
z=diff(f,x)
z(x=-1,y=-1)
}}}

/* code_ends */

 * '''Solution by''': 
   * sneha,student,pec
   * divya,student,pec