Prove that :
\[
\mathrm{I}_{m}\left(z_{1} z_{2}\right)=\mathrm{R}_{...
Prove that :
\[
\mathrm{I}_{m}\left(z_{1} z_{2}\right)=\mathrm{R}_{e}\left(z_{1}\right) \mathrm{I}_{m}\left(z_{2}\right)+\mathrm{R}_{e}\left(z_{2}\right) \mathrm{I}_{m}\left(z_{1}\right) .
\]
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