If A=⎡⎣1tanθ2−tanθ21⎤⎦ and AB = I, then B =

1.	If A=⎡⎣1tanθ2−tanθ21⎤⎦ and AB = I, then B =
Answer» If $A = ⎡ ⎣ \begin{matrix} 1 & t a n \frac{θ}{2} - t a n \frac{θ}{2} & 1 \end{matrix} ⎤ ⎦$ and AB = I, then B =

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