Find the angle between the vectors whose direction cosines are proportional to `2,3,-6` and `3,-4,5.`

Explanation

To find the angle between the vectors whose direction cosines are proportional to \(2, 3, -6\) and \(3, -4, 5\), we can follow these steps:

### Step 1: Define the Direction Cosines
Let the direction cosines of the first vector be:
\[ l_1 = 2, \quad m_1 = 3, \quad n_1 = -6 \]
For the second vector, the direction cosines are:
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