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if A=[[cosalpha,sinalpha],[-sinalpha,cos...

if `A=[[cosalpha,sinalpha],[-sinalpha,cosalpha]]` be such that `A+A'=I` then `alpha`

A

`pi`

B

`pi/3`

C

`pi`

D

`(2pi)/3`

Text Solution

Verified by Experts

The correct Answer is:
B
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RS AGGARWAL-SYSTEM OF LINEAR EQUATIONS-Objective Questions
  1. In the matrix A=[(3-2x,x+1),(2,4)] is singular then X=?

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  2. If A(alpha)=[(cosalpha,sinalpha),(-sinalpha,cosalpha)] then (A(alpha))...

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  3. if A=[[cosalpha,sinalpha],[-sinalpha,cosalpha]] be such that A+A'=I th...

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  4. If A=[(1,k,3),(3,k,-2),(2,3,-4)] is singular then K=?

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  5. If A = [(a; b); (c; d)]; find adjA

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  6. If A=[{:(2x,0),(x,x):}]and A^(-1)=[{:(1,0),(-1,2):}], then what is the...

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  7. If A and B are square matrics of the same order then (A+B)(A-B)=?

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  8. If A and B are square matrics of the same order then (A+B)^2=?

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  9. If A and B are square matrics of the same order then (A-B)^2=?

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  10. If A and B are symmetric matrices of the same order then (AB-BA) is al...

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  11. Matrices A and B will be inverse of each other only if (A) A B" "="...

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  12. If A; B are non singular square matrices of same order; then adj(AB) =...

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  13. If A is a 3-rowed square matrix and |A|=4 then |adjA|=?

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  14. If A is a 3-rowed square matrix and |A|=5 then |adjA|=?

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  15. For any two matrices A and B , we have

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  16. Find a matrix X such that X.[(3,2),(1,-1)]=[(4,1),(2,3)].

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  17. If A is an invertible square matrix then |A^(-1)|=?

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  18. If A; B are invertible matrices of the same order; then show that (AB)...

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  19. If A and B are two nonzero square matrices of the same order such that...

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  20. If A is square matrix such that |A| ne 0 and A^2-A+2I=O " then " A^(-1...

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