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Vectors a,b,c,d are such that `(axx b)xx(cxxd)=O , P_1 and P_2` are two planes determined by vectors a,b and c,d respectively . Then the angle between the planes `P_1 and P_2` is

A

0

B

`pi/4`

C

`pi/3`

D

`pi/2`

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A
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