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Show that a real value of x\ will satis...

Show that a real value of `x\ ` will satisfy the equation `(1-i x)/(1+i x)=a-i b\ if\ a^2+b^2=1` , when `a\ , b` are real.

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The correct Answer is:
`(2b)/((1+a)^(2)+b^(2))`
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