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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

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^@` with the x - axis

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