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Question: clear and thorough proofs please thanks...

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Suppose f is a scalar-valued function of a vector x. The derivative of f with respect to the vector a (also called the gradient of f w.r.t. x) is the vector whose ith component is df/dx a) Let x be a vector. Show that 읊 (zTz) = 2x. b) Let A be a symmetric n x n matrix and r be a vector with n elements. Showat d (T Ar) 2A

clear and thorough proofs please thanks

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