For any two complex numbers \( z_{1} \) and \( z_{2} \), prove that...
For any two complex numbers \( z_{1} \) and \( z_{2} \), prove that \( \operatorname{Re}\left(z_{1} z_{2}\right)=\operatorname{Re} z_{1} \operatorname{Re} z_{2}-\operatorname{Im} z_{1} \operatorname{Im} z_{2} \).
\( \mathrm{P} \)
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