((5 - 4.25) * (3 - 2.75) + (3.5 - 4.25) * (2.5 - 2.75)) / (sqrt((5 - 4.25)^2 + (3.5 - 4.25)^2) * sqrt((3 - 2.75)^2 + (2.5 - 2.75)^2))

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