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The angle between the two vectors hati+h...

The angle between the two vectors `hati+hatj+hatkand2hati-2hatj+2hatk` is equal to

A

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

B

`"cos"^(-1)(1/(6))`

C

`"cos"^(-1)(5/(6))`

D

`"cos"^(-1)(1/(18))`

Text Solution

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The correct Answer is:
A
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