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| rev | Admin | (Created page with "'''Solution: C''' <math display = "block"> {D}_{\mathrm{mod}}=-\frac{\frac{d}{d i}(1+i)^{-n}}{(1+i)^{-n}}=\frac{n(1+i)^{-n-1}}{\displaystyle{(1+i)^{-n}}}=n(1+i)^{-1} </math> {{soacopyright | 2023 }}") | Nov 20'23 at 14:48 | +200 |