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NDA2012MathematicsThree Dimensional GeometryActual

If a line makes the angles , , with the axes, then what is the value of 1+ 2 + 2 + 2 equal to?

Options

  1. A-1
  2. B0
  3. C1
  4. D2

Correct answer

B. 0

Step-by-step solution

aligned & ^2 + ^2 + ^2 =1 & 1+ 2 2 + 1+ 2 2 + 1+ 2 2 =1 & 3+ 2 + 2 + 2 =2 & 1+ 2 + 2 + 2 =0 aligned

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