4. Find the unit tangent vector T(t) to the curve r(t) = (In(cos t), cost, sin t) at time t. (a) (-sint, -sint cos t, cos² t) (b) (-tant, -sin t, cost) (c) (sin t, - sint cost, cos² t) (d) (tant, -sint, cost) (e) None of the other choices.

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