imo class 12 three dimensional geometry

The sum of the squares of direction cosines of a straight line is always equal to:

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The sum of the squares of direction cosines of a straight line is always equal to:

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: B) 1

Explanation: By definition, the sum of squares of direction cosines is l² + m² + n² = 1.

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