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$\bigg(\large\frac{1+i}{1-i}\bigg)^4+\bigg(\frac{1-i}{1+i}\bigg)^4=$

\[(a)\;0 \quad (b)\;1 \quad (c)\;2 \quad (d)\;4 \]

1 Answer

(c) 2
answered Nov 7, 2013 by pady_1
 
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