Find the unit vector parallel to the resultant vector of `2hati+4hatj-5hatk and hati+2hatj+3hatk`.

Explanation

To find the unit vector parallel to the resultant vector of the vectors \( \mathbf{a} = 2\hat{i} + 4\hat{j} - 5\hat{k} \) and \( \mathbf{b} = \hat{i} + 2\hat{j} + 3\hat{k} \), follow these steps:

### Step 1: Define the vectors
Let
\[ \mathbf{a} = 2\hat{i} + 4\hat{j} - 5\hat{k} \]
and
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