Differentiate the following w.r.t x
`tan^(-1) ((cos x - sin x)/(cos x + sin x))`

Explanation

To differentiate the function \( y = \tan^{-1} \left( \frac{\cos x - \sin x}{\cos x + \sin x} \right) \) with respect to \( x \), we will proceed step by step.

### Step 1: Simplify the Expression
We start with the expression:
\[ y = \tan^{-1} \left( \frac{\cos x - \sin x}{\cos x + \sin x} \right) \]

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