Question: . Let f(u) = au = _jaiui for a, u E Rd. Calculate Vuf(u). . Let f(u) = lull? = Equ? for u E Rd.

. Let f(u) = au = _jaiui for a, u E Rd. Calculate Vuf(u). . Let f(u) = lull? = Equ? for u E Rd. Calculate Vuf (u). . Let f(u) = u Au, where u E Rd and A E Rdxd is a symmetric matrix. Calculate Vu.f (u). Note that a, u E R are column vectors. The results should be expressed as column vectors

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