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MHT CET2011MathematicsThree Dimensional Geometry

If , and are the angles which a half ray makes with the positive direction of the axes, then ² + ² + ² is equal to

Options

  1. A1
  2. B2
  3. C0
  4. D-1

Correct answer

B. 2

Step-by-step solution

Given expression, ² + ² + ² array r = (1- ² )+ (1- ² )+ (1- ² ) =3- ² + ² + ² =3-1=2 ( ² + ² + ² =1 ) array

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