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

/* code_begins */


{{{
OBSOLETE
var('x,y')
y=function('y',x)
desolve(diff(y,x,2)*x*x - 4*diff(y,x)*x + 6*y == 21/x^4, dvar = y)
}}}

/* code_ends */

 * '''Solution by''': 
   * Akash Singh, Student, CRCE