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2 0 0 2. Let A be the diagonal matrix 0 4 0First read Exercise 2 of Section 1.5, before continung (a) What would it mean to say that A is nonsingular? (b) Prove that A nonsingular. Give a full explanation using your definition in part Let A be a 4 × 4 matrix with its third row consisting of zeros. (a) What would it mean to say that A is nonsingular? (b) Prove that A is singular. (Hint: Exercise 46, Section 1.5). 3,
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iven a gonal matrix o 4 o e Wn ular ,one ar So ノbu-the definition, pecan say-that Since, if deterwinaunt ts ot 2ero, theu mat

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