1. Find the length of the curve
r(t) = < 2t , 3 sin t, 3 cos t>, a <= t <= b.
2. Find the limit (if it exists)
2. Choosing the path with x=0, we get a limit of 0, if instead we
choose a path with y=x^2, we get
2x^2(x^2)/(x^4+x^4) = 1,
so the limit taking this path is 1. Since these two limits are different, we know that the limit does not exist.
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