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What is the angle between the vecto...

What is the angle between the vector `vec( r)=(4hat(i) +8hat(j) +hat(k)) ` and the x-axis ?

A

`cos^(-1)((13)/(9))`

B

`cos^(-1)((13)/(3))`

C

`cos^(-1)((sqrt(13))/(9))`

D

`cos^(-1)((4)/(9))`

Text Solution

Verified by Experts

The correct Answer is:
D
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