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If n is a positive integer, then (1+i)^(...

If n is a positive integer, then `(1+i)^(n)+(1-i)^(n)=`

A

`(sqrt(2))^(n-2) . cos ((n pi)/(4))`

B

`(sqrt(2))^(n-2) . sin ((n pi)/(4))`

C

`(sqrt(2))^(n+2) . cos ((n pi)/(4))`

D

`(sqrt(2))^(n+2) . sin ((n pi)/(4))`

Text Solution

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The correct Answer is:
C
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HIMALAYA PUBLICATION-COMPLEX NUMBERS-QUESTION BANK
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