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Staring it for a few seconds, Set x=2017, y=2020, the numerator becomes (2017-2018)*(2020-2019)=1; Similarly the denominator becomes (2017-2018)^2 + (2020-2019)^2 = (-1)^2+1^2=2. Isn't finding the solution just as simple as that?
Staring it for a few seconds, Set x=2017, y=2020, the numerator becomes (2017-2018)*(2020-2019)=1; Similarly the denominator becomes (2017-2018)^2 + (2020-2019)^2 = (-1)^2+1^2=2. Isn't finding the solution just as simple as that?