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if A=[(costheta,sintheta),(-sintheta,cos...

if `A=[(costheta,sintheta),(-sintheta,costheta)],then A^(2)=I ` is true for

A

`theta=0`

B

`theta=(pi)/(4)`

C

`theta=(pi)/(2)`

D

None of these

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The correct Answer is:
A
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