If A=[(cos theta,sin theta,0),(-sin thet...

If `A=[(cos theta,sin theta,0),(-sin theta,cos theta,0),(0,0,1)]`, where `A_(11), A_(12), A_(13)` are co-factores of `a_(11), a_(12), a_(13)` respectively , then the value of `a_(11)A_(11)+a_(12)A_(12)+a_(13)=`

A

`-1`

B

1

C

0

D

`(1)/(2)`

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The correct Answer is:

b

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