Find the range of `y = (cot^(-1) x) (cot^(-1) (-x))`

Explanation

To find the range of the function \( y = \cot^{-1}(x) \cdot \cot^{-1}(-x) \), we can follow these steps:

### Step 1: Rewrite \( \cot^{-1}(-x) \)
We know that:
\[ \cot^{-1}(-x) = \pi - \cot^{-1}(x) \]
Thus, we can rewrite the function as:
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