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Question

If ABC and  A2B2C2 , then find the angle between A and B


  1. 300

  2. 600

  3. 900

  4. 1200


Solution

The correct option is C

900


| AB | = | C |

or   A2B2 + 2AB cos θ =   C2 AB cos θ = 0

or cos θ = 0

 θ = 900

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