1.

Ifvec(a) = hat(i) - 2 hat(j) + 3 hat(k) and vec(b) = 2 hat(i) - 3 hat(j) + 5 hat(k) , then angle between vec(a) and vec(b) is

Answer»

`(PI)/(2)`
`(pi)/(2)`
`(pi)/(6)`
`pi`

ANSWER :B


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