Hey guys, its my first post here and I was wondering if you could help.
I need to show the point on the graph of:
has a horizontal tangent line.
I am assume that since I know when its horizontal = 0 for slope and y'=0
ps (when I am writing y' it = yprime)
So step one is find the derivative.
The teacher told us the derivative is 2x-3y-3xy'-2yy'=0
is this right ? can anyone explain it?