hagar

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seen Jan 17 '12 at 17:17

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Jan
17
accepted Is there a formula for $(1+i)^n+(1-i)^n$?
Jan
17
comment Is there a formula for $(1+i)^n+(1-i)^n$?
Thank you, lhf.
Jan
17
comment Is there a formula for $(1+i)^n+(1-i)^n$?
Thanks, so I think $2\Re((1+i)^n)=2(\sqrt{2}^n)\cos(\frac{n\pi}{4})$, which can be evaluated depending on $n\pmod{8}$?
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17
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Jan
17
revised Is there a formula for $(1+i)^n+(1-i)^n$?
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Jan
17
comment Is there a formula for $(1+i)^n+(1-i)^n$?
@lhf Yep, I checked it out from the suggestion here: math.stackexchange.com/questions/98885/…. It's the fourth part of the first exercise.
Jan
17
asked Is there a formula for $(1+i)^n+(1-i)^n$?