Question

(1+i) ( 1-i)-1
$(1 + i)(1 - i) {- }^{1}$
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Answer 1

Answer:

$(1 + i)(1 - i) - 1 \\ = 1(1 - i) + i(1 - i) - 1 \\ = 1 - i + i - {i}^{2} - 1 \\ = i {}^{2} = - 1\\ < < i = \sqrt{ - 1} > >$

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