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Absolutbeloppet av $a + b i$

Absolutbeloppet av komplexa tal skrivna rektangulär form, $a + b i,$ beräknar man genom att först kvadrera och summera talen real- och imaginärdelen. Sedan tar man roten ur summan. T.ex. är $∣ 3 + 2 i ∣ = 3^{2} + 2^{2} = 13 .$

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