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Miscellaneous·2012·Easy

What is the sum of the squares of direction cosines of the line joining the points (1, 2, -3) and (-2, 3, 1)?

What is the sum of the squares of direction cosines of the line joining the points (1, 2, -3) and (-2, 3, 1)?

Options

  1. a.

    0

  2. b.

    1

    Correct answer
  3. c.

    3

  4. d.

    2/√26

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