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Question

If the vectors a, b, c and d are coplanar, then (a×b)×(c×d) is equal to

A
a+b+c+d
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B
0
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C
a+b=c+d
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D
None of these
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Solution

The correct option is B 0
Since a,b,c,d are coplanar, the cross products a×b and c×d is a vector same for both.
their cross product will become 0 since the sine of angle between becomes 0.

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