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solve d/dt (((3 - t)(t - 2) + (5 - t)(t - 4)) / (sqrt((3 - t)^2 + (5 - t)^2)
solve d/dt (((3 - t)(t - 2) + (5 - t)(t - 4)) / (sqrt((3 - t)^2 + (5 - t)^2)
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