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The locus of the point z satisfying arg ...

The locus of the point z satisfying `arg ((z-1)/(z+1))=k`, (where k is non zero) is

A

circle with centre on y -axis

B

circle with centre on x -axis

C

a straight line parallel to x -axis

D

a straight line making an angle `60^(circ)` with the x -axis

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The correct Answer is:
A
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