Question:medium

If $f'(z) = 0$ everywhere in a connected open set $G \subset \mathbb{C}$, then $f(z)$ is

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Connectedness of $G$ is essential! If $G$ were disconnected (e.g., two disjoint open disks), $f(z)$ could take different constant values on each component.
Updated On: Jul 29, 2026
  • $|z|$
  • constant
  • $z^2 + z + 1$
  • $z + 10$
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The Correct Option is B

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