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[" 43.If "|z(1)|=|z(2)|" and "arg(z(1))+...

[" 43.If "|z_(1)|=|z_(2)|" and "arg(z_(1))+arg(z_(2))=(pi)/(2)," then "],[[" A) "z_(1)z_(2)" is purely real "," B) "z_(1)z_(2)" is purely imaginary "],[" C) "(z_(1)+z_(2))^(2)" is purely real "," D) "arg(z_(1)^(-1))+arg(z_(2)^(-1))=pi/2]]

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