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Miscellaneous·2011·Easy

What is the modulus of (1 / (1+3i)) - (1 / (1-3i)) ?

What is the modulus of (1 / (1+3i)) - (1 / (1-3i)) ?

Options

  1. a.

    3/5

  2. b.

    9/25

  3. c.

    3/25

    Correct answer
  4. d.

    5/3

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