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Find the curve's unit tangent vector. Also, find the length of the indicated portion of the curve. 412 r(t) = (-2t cost)i + (2t sin

Find the curve's unit tangent vector. Also, find the length of the indicated portion of the curve. 412 r(t) = (-2t cost)i + (2t sin t)j + 3/2k OstSI 3

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