If A={:[(costheta,-sintheta),(-sintheta,...

If `A={:[(costheta,-sintheta),(-sintheta,costheta)]:},` and AB=BA=I" then "B=

A

`{:[(costheta,sintheta),(-sintheta,costheta)]:},`

B

`{:[(costheta,sintheta),(sintheta,costheta)]:},`

C

`{:[(costheta,-sintheta),(-sintheta,costheta)]:},`

D

`{:[(-costheta,sintheta),(-sintheta,costheta)]:},`

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The correct Answer is:

A

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