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2. Let A be an n by 71 matrix, and X is an n by 1 vector. Let y be another 71 by 1 vector.

2. Let A be an n by 71 matrix, and X is an n by 1 vector. Let y be another 71 by 1 vector. Find the answers for the following differentiation, Where XI is the transpose of X. (a) 8X' AX 8x 0x' AX ax

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