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AP EAMCET202017 Sep 2020Morning ShiftMathematicsThree Dimensional GeometryActual

If a line makes angles ( , , ) with the positive directions of (X, Y ) and (Z )-axes respectively, then the value of ( ^2 + ^2 + ^2 = )

Options

  1. A1
  2. B2
  3. C3
  4. D-1

Correct answer

B. 2

Step-by-step solution

Direction cosines will be (( , , ) ) So, ( ^2 + ^2 + ^2 =1 ) ( ^2 + ^2 + ^2 =2 )

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