4=3i ----> (4,3) 6-2i ------> (6,-2)
x1 y1 x2 y2
(4 , 3) (6 , -2) d=√(x2-x1)^2 +(y2-y1)^2
d=√(6-4)^2+(-2-3)^2 -----> d=√2^2+(-5)^2 ----> d=√29
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