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(1 point) Om z ar ett komplext tal sa sages 2 = Re(2) - Im( 2 ) ; vara dess konjugat och | 2| =

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(1 point) Om z ar ett komplext tal sa sages 2 = Re(2) - Im( 2 ) ; vara dess konjugat och | 2| = v Re(2)2 + Im (2)2 dess absolutbelopp (eller avstand till origo i det komplexa talplanet). Lat aven Z beteckna konjugatet av Z. Med detta i atanke, avgor vilka av foljande pastaenden som ar sanna. A. Kvoten av tva nollskilda komplexa tal ar ett komplext tal. B. in = iom n =4 1. [ C. Om Re( z ) ar ett rationellt tal sa ar z + z ett rationellt tal. D. Im( z . z) = 0 for komplexa tal z. O E. (2 - 20) (2 - 20) = 22 - 2Re(zo) z + |zo|2 for alla komplexa tal z och zo

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