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[A=[[0,-tan(theta/2)],[tan(theta/2),0]](...

[A=[[0,-tan(theta/2)],[tan(theta/2),0]](theta!=],[I+A" is equal to "],[" (A) "(I-A)B],[" (B) "(I-A)^(2)B],[" (C) "(I-A)B^(2)],[" (D) "(I-A)^(2)B^(2)]

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