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If A=[(1,-tantheta),(tantheta, 1)] [(1,t...

If `A=[(1,-tantheta),(tantheta, 1)] [(1,tantheta),(-tantheta,1)]^-1`=`[(a,-b),(b,a)]` then (A) `a=b=-1` (B) `a=sin2theta, b=cos2theta` (C) `a=cos2theta, b=sin2theta` (D) none of these

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