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Find the curve's unit tangent vector. Also, find the length of the indicated portion of the curve. 21/2 r(t) = (t cost)i + (t sin

Find the curve's unit tangent vector. Also, find the length of the indicated portion of the curve. 21/2 r(t) = (t cost)i + (t sin t)j + -3/2 2K OstST 3 . . . The curve's unit tangent vector is K. (Type exact answers, using radicals as needed.)

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