((2-x2) - (2-x1))2 =

((2-x2) - (2-x1))2 =

(2- x2 -2+ x1) 2 =

(2- x2 -2+ x1) 2 = (-x2+x1) 2 =

(x2-x1) 2

similarly

((y2+2) - (y1+2))2 = (y2 - y1)2

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