Find the length of the curve (t) = (cos(t), sin(t), t) for -7≤t≤3 Give your answer to two decimal places Find the unit tangent vector to the curve defined by (t) = (5 cos(t), 5 sin(t), 2 sin²(t)) at t=π. Ť(T) = Use the unit tangent vector to write the parametric equations of a tangent line to the curve at t = π. x(t) y(t) z(t) = = =