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If vec(a) = (1)/(sqrt10) (3hat(i) + hat(...

If `vec(a) = (1)/(sqrt10) (3hat(i) + hat(k) ) and vec(b) = (1)/(7) (2hat(i)+ 3hat(j)- 6hat(k))`, then the value of `(2 vec(a)- vec(b)).[(vec(a) xx vec(b)) xx (vec(a) +2 vec(b))]` is

A

`-5`

B

`-3`

C

5

D

3

Text Solution

Verified by Experts

The correct Answer is:
A
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