Practicing Success
Practicing Success
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If the vectors $\vec a,\vec b,\vec c$ and $\vec d$ are coplanar vectors, then $(\vec a×\vec b)×(\vec c×\vec d)$ is equal to |
$\vec a+\vec b+\vec c+\vec d$ $\vec 0$ $\vec a+\vec b=\vec c+\vec d$ none of these |
$\vec 0$ |
Clearly, $\vec a×\vec b$ is parallel to $\vec c×\vec d$. $∴(\vec a×\vec b)×(\vec c×\vec d)=\vec 0$ |
