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If (1-ix)/(1+ix)=a-ibanda^(2)+b^(2)=1,wh...

If `(1-ix)/(1+ix)=a-ibanda^(2)+b^(2)=1,where` `a,b in Randi=sqrt(-1),` then xis equal to

A

`(2a)/((1+a)^(2)+b^(2))`

B

`(2b)/((1+a)^(2)+b^(2))`

C

`(2a)/((1+b)^(2)+a^(2))`

D

`(2b)/((1+b)^(2)+a^(2))`

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