||'''Book'''|| Getting started with MATLAB ||
||'''Author'''|| Rudra Pratap ||
||'''Edition'''|| ||
/* code_begins */
{{{
sage: x,y,z=var('x,y,z')
sage: contour_plot(-1/2*x**2+x*y+y**2,(x,-5,5),(y,-5,5))
}}}
/* code_ends */
* '''Solution by''':
* , < STUD.>, < SIT,pUNE>
* , ,