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If A=[(1,tan(theta/2)),(-tan(theta/2),1)...

If `A=[(1,tan(theta/2)),(-tan(theta/2),1)] and AB=I, then B=` (A) `{cos^2 (theta/2)}A` (B) `{cos^2(theta/2)}A\'` (C) `{cos^2(theta/2)}I` (D) none of these

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