Let \( z \) and \( w \) be two non-zero complex numbers such that \...

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Let \( z \) and \( w \) be two non-zero complex numbers such that \( |z|=|w| \) and \( \arg (z)+\arg (w)=\pi \), then \( z \) equals
(a) \( w \)
(b) \( -w \)
(c) \( \bar{w} \)
\( (1995,2 \mathrm{M}) \)
P
W
(d) \( -\bar{w} \)
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