((1 - 2.25) * (0.5 - 1.75) + (3.5 - 2.25) * (3 - 1.75)) / (sqrt((1 - 2.25)^2 + (3.5 - 2.25)^2) * sqrt((0.5 - 1.75)^2 + (3 - 1.75)^2))

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