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Measure of the angle between the vector ...

Measure of the angle between the vector `vec(a)=hati-hatj+hatk` and `vec(b)=hati+hatj+hatk` is …………..

A

` sin^(-1)"" ( 2 sqrt2)/( 3)`

B

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

C

`cos^(-1)""(1)/( sqrt3)`

D

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

Text Solution

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The correct Answer is:
A
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