3. Sketch the curve given by p(t) = (tsint, tcost, () , t 2 0, and indicate with arrows the direction in which { increases. Justify your work. 7pts]4. Suppose u and 7 are differentiable vector-valued functions ( with values in Vs), c is a scalar, and f is a real-valued function (i.e f is a scalar-valued function). Prove that Ha(f(t))] = f(t)u'(f(t)) 7pts]