If | vec x| = 13 then direction angles ...

If ` | vec x| = 13` then direction angles of `vec(x)` are `cos^-1(3/13) , cos^-1(4/13) and cos^-1(12/13)`

A

` 3 hat(i) + 4 hat(j) - 12 hat(k)`

B

` 3 hat(i) + 4 hat(j) + 12 hat(k)`

C

`3 hat(i) - 4 hat(j) + 12 hat(k)`

D

` 3 hat(i) - 4 hat(j) - 12 hat(k)`

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