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For a invertible matrix A if A(adjA)=[(1...

For a invertible matrix A if `A(adjA)=[(10,0),(0,10)]`, then |A|=

A

20

B

30

C

10

D

40

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  10. If A={:[(secx,tanx),(tanx,secx)]:}" and "A(adj*A)=k{:[(1,0),(0,1)]:},"...

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  11. If A=[[0,1] , [-1,0]]=(alphaI+betaA)^2 then alpha and beta =

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  12. If A={:[(2,1),(3,2)]:}" and "B={:[(1,2),(-1,3)]:}," then: "B^(-1)A=

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  17. If A={:[(0,5),(4,0)]:}" and "A^(-1)=kA," then: "k=

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  18. If f(x)=1+x+x^(2)+x^(3)" and "A={:[(0,3),(0,0)]:}," then: "f(A)=

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  19. If A=-BAB^(-1)," then: "(A+B)^(2)=

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