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

/* code_begins */

{{{
x,y=var('x,y')
plot3d(x^2+y^2==a(x,-1,1),(y,-1,1)
}}}

/* code_ends */

 * '''Solution by''': 
   * <g.mamatha>, <student>, <prakasam engg college>
   * <VVL Amruthavalli>, <student>, <prakasam engg college>