1.

Let the vectors veca, vecb, vecc and vecd be such that (veca xx vecb) xx (veccxx vecd) = vec0. Let P_(1), P_(2) be planes determined by the pairs of vectors veca, vecb and vecc, vecd respectively. Then the between P _(1) and P _(2) is :

Answer»

0
`pi//4`
`pi//3`
`pi//2.`

ANSWER :A


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