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[" Q17.If "n" is a positive integer then...

[" Q17.If "n" is a positive integer then value of "(1+i)^(n)+(1-i)^(n)" is: "],[[" (a) "2^((3))cos(n pi)/(4)," (b) "2^((3)-1)cos(n pi)/(4)," (c) "2^((3)+1)cos(n pi)/(4)," (d) "2^((3)+1)sin(n pi)/(4)]]

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