If \( \left|\frac{z_{1}}{z_{2}}\right|=1 \) and \( \arg \left(z_{1} z_{2}\right)=0 \) then....
If \( \left|\frac{z_{1}}{z_{2}}\right|=1 \) and \( \arg \left(z_{1} z_{2}\right)=0 \) then
\( \mathrm{P} \)
(1) \( z_{1}=z_{2} \)
(2) \( \left|z_{2}\right|^{2}=z_{1} z_{2} \)
(3) \( z_{1} z_{2}=1 \)
(4) None of these
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