For the given position vectors r(t) compute the unit tangent vector T(t) for the given value of t. A) Let r(t) (cost, sin t). Then T(4)=( 1 B) Let r(t) = (t2, t³). Then T(1)= ( C) Let r(t) = ei + e tj + tk. Then T(1)= i+ j+ ) ) k.

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