Question Number 198551 by HomeAlone last updated on 21/Oct/23
Commented by HomeAlone last updated on 21/Oct/23
$$\sqrt{−\mathrm{1}} \\ $$$$\mathrm{1i}\:{is}\:{useful}\:{to}\:{the}\:{lands}\:\boldsymbol{\mathrm{but}}\:\boldsymbol{\mathrm{no}} \\ $$$$\boldsymbol{{complex}}\:\boldsymbol{\theta}\pi\:−>\:{i} \\ $$$${e}_{{c}_{\mathrm{1}} } \\ $$