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If OA = 2hati + 2hatj+ hatk, OB = 2hati ...

If `OA = 2hati + 2hatj+ hatk, OB = 2hati + 4hatj + 4hatk ` and the length of the internal bisector of `angle BOA ` of triangle AOB is k, then `9k^(2) = `

A

A 225

B

B 136

C

C 712

D

D 20

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