Find the direction cosines of the vector joining the points `A(1, 2, -3) and B(-1, -2, 1)` directed from `A` to `B`.

Explanation

To find the direction cosines of the vector joining the points \( A(1, 2, -3) \) and \( B(-1, -2, 1) \) directed from \( A \) to \( B \), we will follow these steps:

### Step 1: Determine the vector \( \overrightarrow{AB} \)

The vector \( \overrightarrow{AB} \) can be calculated using the formula:
\[ \overrightarrow{AB} = B - A \]
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