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((3.1 + 0.1*t^2) * 0.2*t) / (sqrt(2) * sqrt((3.1 + 0.1*t^2)^2 + 34)) /. t=3
((3.1 + 0.1*t^2) * 0.2*t) / (sqrt(2) * sqrt((3.1 + 0.1*t^2)^2 + 34)) /. t=3
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