If `veca = (-hati + hatj - hatk)` and `vecb = (2hati- 2hatj + 2hatk)` then find the unit vector in the direction of `(veca + vecb)`.

Explanation

To find the unit vector in the direction of \(\vec{a} + \vec{b}\), we will follow these steps:

### Step 1: Find \(\vec{a} + \vec{b}\)

Given:
\[ \vec{a} = -\hat{i} + \hat{j} - \hat{k} \]
...