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If A(alpha)=[(cos alpha,sinalpha),(-sina...

If `A_(alpha)=[(cos alpha,sinalpha),(-sinalpha,cosalpha)]` then `A_(alpha) A_(beta)` is equal to A)`A_(alpha beta)` B)`A_(alpha +beta)` C)`A_(alpha - beta)` D)None of these

A

`A_(alpha beta)`

B

`A_(alpha +beta)`

C

`A_(alpha - beta)`

D

None of these

Text Solution

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The correct Answer is:
B
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