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Question: How to explain the result of this direction limit?

Question:How to explain the result of this direction limit?

minhthien2016 370 Maple
limit
March 02 2019
0

I want to find limit of the function sqrt(x^2 - 3 x + 2) from the left of the point x = 2. I tried
limit(sqrt(x^2-3*x+2), x = 2, left)

I got the result 0.  I know that, the limit is not exits. How to explain the result of Maple?

Another example, 
limit(sqrt(x^2-3*x+2), x = 2, real)

I got the output 0.

With Mathematica, I see at here https://mathematica.stackexchange.com/questions/102981/limit-sqrt3-x-as-x-to3
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