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A vector vecr is equally inclined with t...

A vector `vecr` is equally inclined with the vectors
`veca=cos thetahati+sin theta hatj, vecb=-sin theta hati+cos theta hatj` and `vecc=hatk`, then the angle between `vecr` and `veca` is

A

`cos^(-1)((1)/(sqrt2))`

B

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

C

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

D

`pi/2`

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The correct Answer is:
B
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