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

If `A=[[0,-tan(theta/2)],[tan(theta/2),0]](theta!=npi,n in Z),B=[[costheta,-sintheta],[sintheta,costheta]]` and `I=[[1,0],[0,1]]`, then the value of `(2I)/(costheta+1)` is equal to

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