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Let vectors ` vec a , vec b , vec c ,a n d vec d` be such that `( vec axx vec b)xx( vec cxx vec d)=0.` Let `P_1a n dP_2` be planes determined by the pair of vectors ` vec a , vec b ,a n d vec c , vec d ,` respectively. Then the angle between `P_1a n dP_2` is a.`0` b. `pi//4` c. `pi//3` d. `pi//2`

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