If amp \( \frac{z-1}{z+1}=\frac{\pi}{3} \) then \( z \) represents a point on (a) a straight lin...

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If amp \( \frac{z-1}{z+1}=\frac{\pi}{3} \) then \( z \) represents a point on
(a) a straight line
(b) a circle
(c) a pair of lines
(d) none of these
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