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Question: Answered & Verified by Expert
Let $z$ be a complex number such that the principal value of argument, arg $z>0$ Then, arg $z-\arg (-z)$ is
MathematicsComplex NumberWBJEEWBJEE 2019
Options:
  • A $\frac{\pi}{2}$
  • B $\pm \pi$
  • C $\pi$
  • D $-\pi$
Solution:
1694 Upvotes Verified Answer
The correct answer is: $\pi$
$\begin{aligned} \therefore \arg (z)-\arg (-z) &=\theta-(-\pi+\theta) \\ &=\pi \end{aligned}$

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