Chapter 13 - Partial Derivatives - 13.1 Functions Of Two Or More Variables - Exercises Set 13.1 - Page 916: 51

Z= x^2+y^2. ;. K=(0,1,2,3,4)

First of All we have drawing Cartesian plan.its one axis is x-axis and another is y-axis. Now we are encircle around four lines . Where origin is zero , first circle line denoted 1 , second circle line denoted 2 , third circle line denoted 3 and last circle line denoted 4.