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If vector (A1 and A2) are two non-­collinear unit vectors and if | vector (A1 + A2) | = √3, then the value of vector (A1 - A2) . (vector (2A1 + A2))

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If vector (A1 and A2) are two non-­collinear unit vectors and if | vector (A1 + A2) | = √3, then the value of vector (A1 - A2) . (vector (2A1 + A2))

  1. 1 
  2. 1/2 
  3. 3/2 
  4. 2
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Correct Answer : 2. 1/2

Explanation :

If angle between A1 and A2 is θ.

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