1.

If a and b are respectively the internal and external bisectors of the angles between the vetors-hati + 2 hatj - 2 hatk " and " 3 hati + 4 hatj " and " |a| = 2/3 sqrt6, | b | = 2/3 sqrt3 , then one of the values of a-b is

Answer»

`1/10(-8hati + 11 HATJ - 2 hatk)`
`2/3(-HATI + 2 hatj- 2 hatk)`
`1/15 (9hati- 11hatj + 3 hatk)`
`1/12 (2hati - 3 hatj - hatk)`

Answer :B


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