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If |(1,-t a ntheta),(t a ntheta,1)| |(1,...

If `|(1,-t a ntheta),(t a ntheta,1)| |(1,t a ntheta),(-t a ntheta,1)|^-1=|[a,-b],[b ,a]|` , then a. `a=cos2theta` b. `a=1` c. `b=sin2theta` d. `b=-1`

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