комплексные числа
i^40-i^21=
i^40 = i^4k=i^4*10=1;
i^21=i^(4k-3)=i^(4*6-3)=i
=> i^40-i^21=1-i.
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i^40 = i^4k=i^4*10=1;
i^21=i^(4k-3)=i^(4*6-3)=i
=> i^40-i^21=1-i.