A : (1+i)^(6)+(1-i)^(6)=0 R : If n is ...

A : `(1+i)^(6)+(1-i)^(6)=0`
R : If n is a positive integer then `(1+i)^(n)+(1-i)^(n)=2^((n//2)+1).cos""(npi)/(4)`

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The correct Answer is:

`2^((n+2)/(2))cos""(npi)/(4)`

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