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Question

If open parentheses fraction numerator 1 plus straight i over denominator 1 minus straight i end fraction close parentheses to the power of straight x equals 1, then

  1. x=4n, where  is any positive integer
  2. x=2n, where  is any positive integer
  3. x=4n+1, where  is any positive integer
  4. x=2n+1, where  is any positive integer

The correct answer is: x=4n, where  is any positive integer

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