Q 1387123087.     he vectors `vec a, vec b,vec c, vec d` be are such that `(vec a times vec b) times (vec c times vec d)=0` and `P_1, P_2` are two planes containing the pair of vectors `vec a, vec b` and `vec c, vec d` respectively, then the angle between the planes is ?


A

`frac{pi}{2}`

B

`frac{pi}{4}`

C

`frac{pi}{3}`

D

`0`

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