Find the value of: `cot(tan^(-1)a+cot^(-1)a)`

Explanation

To find the value of \( \cot(\tan^{-1} a + \cot^{-1} a) \), we can use the property of inverse trigonometric functions.

### Step 1: Use the property of inverse trigonometric functions
We know that:
\[ \tan^{-1} x + \cot^{-1} x = \frac{\pi}{2} \]
for any real number \( x \).
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