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If S={(alpha+i)/(alpha-i),alphainR} then...

If `S={(alpha+i)/(alpha-i),alphainR}` then the S lies on

A

a circle with radius `=sqrt(2)`

B

a straight line with slope `=-1`

C

a straight line with slope `=1`

D

a circle with radius `=1`

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The correct Answer is:
D
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