1.

For any two complex numbers \[{{z}_{1}},{{z}_{2}}\]we have \[|{{z}_{1}}+{{z}_{2}}{{|}^{2}}=\] \[|{{z}_{1}}{{|}^{2}}+|{{z}_{2}}{{|}^{2}}\] then

A. \[\operatorname{Re}\left( \frac{{{z}_{1}}}{{{z}_{2}}} \right)=0\]
B. \[\operatorname{Im}\left( \frac{{{z}_{1}}}{{{z}_{2}}} \right)=0\]
C. \[\operatorname{Re}({{z}_{1}}{{z}_{2}})=0\]
D. \[\operatorname{Im}({{z}_{1}}{{z}_{2}})=0\]
Answer» B. \[\operatorname{Im}\left( \frac{{{z}_{1}}}{{{z}_{2}}} \right)=0\]


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