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Find the arc length of the curve `x = 1/3t^3 , y = 1/2t^2` with `1 <= t <= 7`.
Box 1: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
`1/3(sqrt(50^3)-sqrt(2^3))`