If A(theta) = [(cos theta ,sin theta ),(...

If `A_(theta) = [(cos theta ,sin theta ),(-sin theta ,cos theta )] ` then `A_(alpha)A_(beta)` equals :

A

`A(alpha)-A(beta)`

B

`A(alpha)+A(beta)

C

`A(alpha-beta)`

D

`A(alpha+beta)`

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The correct Answer is:

D

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