If a and b are vectors such that | a |=2, | b |=7 and a b =3 i +2 j +6 k , then what is the acute angle between a and b ?

NDA 2018 Mathematics question

If and are vectors such that , and , then what is the acute angle between and ?

Answer: (A)

\vec\vec\sqrt{9+4+36}\vec\vec\sin$θ =

Create a free account to read the complete working, and practise questions like this in a timed test.

Question ID VK-028877