The vertices of a `Delta ABC` are `A(2, 3, 1)`, `B( -2, 2, 0)` and `C(0, 1, -1)`. What is the cosine of angle `ABC?`

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Q 1713156940.     The vertices of a `Delta ABC` are `A(2, 3, 1)`,
`B( -2, 2, 0)` and `C(0, 1, -1)`.

What is the cosine of angle `ABC?`
NDA 2014 Paper 1 April
A

`1 /sqrt(3)`

B

`1/sqrt(2)`

C

`2/sqrt(6)`

D

None of these

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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