2. Compute the magnitude of the tangent vector and the unit tangent vector at t = 1 for each of the following vector functions. Provide a sketch of the curve from t=0 to t = 1. (a) r(t) = (t, sin(-t), cos(-t)) (b) s(t)= (t, t cos (2t), t sin (2t)) (c) u(t)= (t sin(100t), t, t cos(100t))