यदि `vec(A) = - 2 hat(i) + 3 hat(j) - 4 hat(k), vec(B) = 3 hat(i) - 4 hat(j) = 5 hat(k)` हो तो `vec(A) * vec(B)` ज्ञात करो

Explanation

`vec(A) *vec(B) = (-2 hat(i) + 3 hat(j) - 4 hat(k))* ( 3 hat(i) - 4 hat(j) + 5 hat(k)) = - 38`