Question: If evaluate (a) X T X, (b) AX, (c)X T (AX) and (d) 1/2X T [(A T + A)X].

If

[120] 1 0 2 1 1 A = 1 and X= x y Z

evaluate

(a) XTX,

(b) AX,

(c) XT(AX) and

(d) 1/2XT[(AT + A)X].

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