Question Number 182011 by mathocean1 last updated on 03/Dec/22
$${Is}\:{this}\:{true}\:{for}\:{complex}\:{number}: \\ $$$$\mathrm{4}\mathscr{R}{e}\left({z}_{\mathrm{1}} \overline {{z}_{\mathrm{2}} }\right)=\mid{z}_{\mathrm{1}} +\overline {{z}_{\mathrm{2}} }\mid^{\mathrm{2}} −\mid{z}_{\mathrm{1}} −\overline {{z}_{\mathrm{2}} }\mid^{\mathrm{2}} \\ $$
Commented by Frix last updated on 03/Dec/22
$$\mathrm{The}\:\mathrm{question}\:\mathrm{is}\:\mathrm{strange}.\:\mathrm{If}\:\mathrm{you}\:\mathrm{only}\:\mathrm{use} \\ $$$$\overset{−} {{z}}_{\mathrm{2}} \:\mathrm{you}\:\mathrm{could}\:\mathrm{instead}\:\mathrm{use}\:{z}_{\mathrm{3}} \:\mathrm{because}\:\mathrm{it}\:\mathrm{will} \\ $$$$\mathrm{make}\:\mathrm{no}\:\mathrm{difference}. \\ $$$$\mathrm{Anyway}\:\mathrm{as}\:\mathrm{posted}\:\mathrm{it}'\mathrm{s}\:\mathrm{wrong}. \\ $$
Answered by alephzero last updated on 03/Dec/22