Q. 205.0( 2 Votes )

If <span lang="EN

Answer :

Given that

Take cross product with ,


We know that

Now take cross product of b with given


From (i) and (ii)

Hence proved

We also need to show that

Now means vector triple product which is


Now is perpendicular to .

As cos 90° = 1

So, the dot product of with a perpendicular vector to is 0.

Hence proved

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