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Angle between vectors hati - hatj + hatk...

Angle between vectors `hati - hatj + hatk and hati + 2 hatj + hatk` is :

A

`cos ^(-1) (1 )/(sqrr15)`

B

`cos ^(-1) (4)/(sqrt15)`

C

`cos ^(-1) (4)/(15)`

D

`(pi)/(2).`

Text Solution

Verified by Experts

The correct Answer is:
D
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