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सिद्ध कीजिए - (i) i^(80)=1 (ii) (i^(2)...

सिद्ध कीजिए -
(i) `i^(80)=1` (ii) `(i^(2)+i^(4)+i^(6)+i^(7))/(1+i^(2)+i^(3))`

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