If a, b, c, d are coplanar vectors,then (a ti | vedclass

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(A) Given that $a, b, c$ and $d$ are coplanar vectors.Since $a$ and $b$ are coplanar,their cross product $a 	imes b$ is a vector perpendicular to the

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(A) Given that $a, b, c$ and $d$ are coplanar vectors.Since $a$ and $b$ are coplanar,their cross product $a 	imes b$ is a vector perpendicular to the plane containing $a$ and $b$.Similarly,since $c$ and $d$ are coplanar,their cross product $c 	imes d$ is a vector perpendicular to the plane containing $c$ and $d$.Since all four vectors $a, b, c, d$ lie in the same plane,the vectors $a 	imes b$ and $c 	imes d$ are both perpendicular to the same plane.Therefore,$a 	imes b$ and $c 	imes d$ are parallel to each other.Since the cross product of two parallel vectors is zero,we have $(a 	imes b) 	imes (c 	imes d) = 0$.

If $a, b, c, d$ are coplanar vectors,then $(a \times b) \times (c \times d)$ is equal to

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