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simplify sqrt((y_2 - y_1/2)^2 + (x_2 - x_1/2)^2) * sqrt(x_1^2 + y_1^2)
simplify sqrt((y_2 - y_1/2)^2 + (x_2 - x_1/2)^2) * sqrt(x_1^2 + y_1^2)
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