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[" (b) "diag([a(1),a(2)],[" (c) "," In "...

[" (b) "diag([a_(1),a_(2)],[" (c) "," In "]],[" 11.If "A=[[b,b^(2)],[-a^(2),-ab]]" ,then "A" is "],[[" (a) Idempotent "," (b) none of these "],[" (c) nilpotent "," (b) involutory "]],[" (d) scalar "]

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