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যদি এবং  এর দিকে  এর অভিক্ষেপ -2 হয়, তাহলে  ?

  1. 4
  2. 3
  3. 2
  4. 1

Answer (Detailed Solution Below)

Option 1 : 4
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Detailed Solution

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ধারণা:

 এর দিকে  এর অভিক্ষেপ =  

গণনা:

প্রদত্ত, এবং এর অভিক্ষেপের দিক থেকে হল -2

আমরা জানি যে,

 এর দিকে  এর অভিক্ষেপ = 

⇒ - 2 =

⇒ - 2 =

⇒ - 2 =

⇒

তাই, যদি  এবং  এর দিকে  এর অভিক্ষেপ -2 হয়, তাহলে  4

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