||'''Book'''|| Getting started with MATLAB ||
 ||'''Author'''|| Rudra Pratap ||
 ||'''Edition'''||  ||

/* code_begins */

{{{

sage: y,z=var('y,z')
sage: plot3d((-5/(1+x**2+y**2)),(x,-3,3),(y,-3,3))

}}}

/* code_ends */

 * '''Solution by''': 
   * < VINAY >, < STUDENT .>, < Symbiosis,Pune >
   * <Your Name>, <Profession>, <Organization>