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Let-z-C-so-1-z-2-lt-1-Prove-that-2-1-z-2-1-

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Question Number 55671 by gunawan last updated on 01/Mar/19
Let z ∈ C , so ∣1+z^2 ∣<1. Prove that 2∣1+z^2 ∣≥1
Letz∈C,so∣1+z2∣<1.Provethat2∣1+z2∣⩾1

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