1.

If vec(a), vec(b) are unit vectors satisfying (5vec(a) + 3vec(b)) xx (3vec(a) -7vec(b))=vec(0), then (vec(a), vec(b)) is

Answer»

`(pi)/(2)`
`(pi)/(3)`
`(pi)/(6)`
`0 or pi`

ANSWER :D


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