find the curve’s unit tangent vector. also, find the length of the indicated portion of the curve.

Find the curves unit tangent vector. Also, find the length of the indicated portion of the curve. r(t) = (2 cos t) j + (2 sin t) k, 0 ts- Choose the correct answer for the unit tangent vector of r(t) ○ A. (-cos t)j + (sin t)k O B. (sin t)j + (cost)k (-cos tj + (sin *t)k (sin *t)j + (cos t)k The length of the curve is (Type an integer or a simplified fraction.,)

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