Need some help finding limit. I tried to show that the limit DNE by setting x as 0, but that didn't work, so I tried setting y as 0, that didn't work either, so I tried setting y as 2, and that didn't work either. I am a bit stuck :/
lim (2xy-2y)/(x^2+y^2-2x+1)
X,Y-> (1,0)

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what do we need to prove in order to define a limit as DNE?

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