1.

Let the vectors bara, barb, barc, bard be such that (bara xx barb) xx (barc xx bard) = bar0. Let pi_(1), pi_(2) be planes determined by the pairs of vectors bara, barb and barc, bard respectively, then angle betwen pi_(1) and pi_(2) is

Answer»

`0^(@)`
`30^(@)`
`45^(@)`
`60^(@)`

ANSWER :A


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