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Angle between hati+hatj+hatk and hati-ha...

Angle between `hati+hatj+hatk` and `hati-hatj+hatk` is a) `cos(-1)(1/3)` b) `cos^(-1)(1/3)` c) `sin^(-1)(1/3)` d) None of the above

A

`cos(-1)(1/3)`

B

`cos^(-1)(1/3)`

C

`sin^(-1)(1/3)`

D

None of the above

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