मराठी

Let a¯,b¯ and c¯ be three vectors, then a¯×(b¯×c¯)=(a¯×b¯)×c¯ if -

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प्रश्न

Let `bara, barb` and `barc` be three vectors, then `bara xx (barb xx barc) = (bara xx barb) xx barc` if

पर्याय

  • `barb xx (bara xx barc) = bar(0)`

  • `barb xx barc = bara xx barb`

  • `bara . barc = barb xx barc`

  • `bara xx barb = barc xx a`

MCQ

उत्तर

`barb xx (bara xx barc) = bar(0)`

Explanation:

Given `veca xx (vecb xx vecc) = (veca xx vecb) xx vecc`

⇒ `(veca.vecc)vecb - (vecb.vecc)veca = (vecc.veca)vecb - (vecb.veca)vecc`

⇒ `(vecb.vecc)veca = (vecb.veca)vecc` .....`[because veca.vecc = vecc.veca]`

⇒ `(vecb.vecc)veca - (vecb.veca)vecc = vec(0)`

⇒ `vecb xx (veca xx vecc) = vec(0)`

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