Answers

2015-04-06T23:37:32+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let\ \theta\ be\ angle\ from\vec{A}\ to\ \vec{B}\ in\ the\ anti-clockwise\ direction.\\Then,\ -\theta\ or\ (2\pi - \theta)\ is\ the\ angle\ from\ \vec{B}\ to\ \vec{A}\\\\given,\ \vec{A} \times \vec{B}=\vec{B} \times \vec{A}\\\\So,\ A *B*Sin\theta=B*A*\sin(2\pi - \theta)=-A*B*Sin\theta\\\\Hence,\ sin\theta=0\\\\\theta=0^0\ \ or\ \ 180^0

The vectors A and B are aligned, either in the same direction or in the opposite directions.
1 5 1
Why you have taken angle between vector in anticlockwise direction.....
angle in the anticlockwise is positive as per convention.