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The angle theta between the vector vec(p...

The angle `theta` between the vector `vec(p)=hat(i)+hat(j)+hat(k)` and unit vector along X-axis is

A

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

B

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

C

`cos^(-1)((sqrt3)/(2))`

D

`cos^(-1)((1)/(2))`

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The correct Answer is:
A
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