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Consider the vectors, `vec(a),vec(b),vec(c),vec(d)` such that `(vec(a)xxvec(b))xx(vec(c)xxvec(d))=vec(0)" Let "P_(1)andP_(2)` be the planes determined by the pairs of vectors, `vec(a),vec(b)andvec(c),vec(d)` respectively. Then the angle between `P_(1)andP_(2)` is

A

0

B

`pi//4`

C

`pi//3`

D

`pi//2`

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The correct Answer is:
A
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MOTION-VECTOR -EXERCISE - 1
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