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If A(alpha)=[[cos alpha,sin alpha],[-sin...

If `A(alpha)=[[cos alpha,sin alpha],[-sin alpha,cos alpha]]` then `A(alpha)A(beta)`

A

`A_(alpha+beta)`

B

`A_(alphabeta)`

C

`A_(alpha-beta)`

D

none of these

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The correct Answer is:
A
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MCGROW HILL PUBLICATION-MATRICES-SOLVED EXAMPLES ( LEVEL 1 ( Single Correct Answer Type Questions ) )
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  3. If A(alpha)=[[cos alpha,sin alpha],[-sin alpha,cos alpha]] then A(alph...

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  4. Let Aa n dB be two 2xx2 matrices. Consider the statements A B=O A+Oo...

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  5. If A-2B=[1 5 3 7]a n d2A-3B=[-2 5 0 7] the matrix B= [-4-5-6-7] (b) ...

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  7. If A = ((costheta,-sintheta),(sintheta,costheta)) then

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  8. If A=[(a^(2),ab,ac),(ab,b^(2),bc),(ac,bc,c^(2))] "and B"= [(0,c,-b),(-...

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  10. Prove that the product of the matrices [[cos^2alpha, cosalphasinalpha]...

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  11. If [(2,1),(7,4)]A[(-3,2),(5,-3)]=[(1,0),(0,1)] then matrix A equals

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  12. The matrix A satisfying A[[1, 5], [0, 1]]=[[3, -1], [6, 0]] is

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  13. If product of matrix A with [(1,1),(2,0)] is [(3,2),(1,1)] then A^(-1)...

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  14. If A and B are two skew symmetric matrices of order n then

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  16. If A and B are symmetric matrices then A B-B A is a Symmetric Matrix ...

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  17. Let A and B be two 3xx3 matrices such that A+B = 2 B' and 3A + 2B= I ...

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  19. If A is skew-symmetric and B=(I-A)^(-1)(I+A), then B is

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