Let u = u(x, y), and let (r, 0) be polar coordinates. Then 1 || Vu||? = u; + u3 Use this to compute || Vu||2 for u(r, 0) = r² cos² (0). (Express numbers in exact form. Use symbolic notation and fractions where needed. Give your answer in terms of r and 0.) ||Vu|l? = Use the fact that u(x, y) x to compute ||Vu||², in terms of x and y, directly. (Express numbers in exact form. Use symbolic notation and fractions where needed. Give your answer in terms of r and 0.) || Vu||? =

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