Hello i dont understand my professor answer i did the problem differently but i dont know if its rigouruous enough. The yellowish photo is my prof answer i dont understand how she can détermine the radius
serene storm
Hello i dont understand my professor answer i did the problem differently but i dont know if its rigouruous enough. The yellowish photo is my prof answer i dont understand how she can détermine the radius
round zenithBOT
serene storm
She choose a radius r and un in the ball with origin (a,b) and radius r the partial derivative are 0 so they’re continuous => f is differentiable => f is continuous. I dont understand how she chooses her radius
serene storm
Help please🫠