Question:
If x < 0 is a real number, then arg (x) = ____________.
Solution:
If x < 0
i.e z = x + i 0 and x is negative
$\Rightarrow \theta=\tan ^{-1}\left|\frac{0}{x}\right|=\tan ^{-1} 0=0$
Hence, $z$ lies in II quadrant chg $z=\pi$.
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