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Let vectors veca, vecb veca and vecd be ...

Let vectors `veca, vecb veca and vecd` be such that `(veca xxvecb)xx (veccxxvecd)=vec0. " Let " P_(1)and P_(2)` be planes determined by the pairs of vectors `veca,vecb and vecc ,vecd` , respectively. Then the angle between `P_(1) and P_(2)` is

A

0

B

`pi//4`

C

`pi//3`

D

`pi//2`

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Verified by Experts

The correct Answer is:
C
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