Differentiate :
(i) `((sinx + cosx)/(sinx - cos x))` , (ii) `((sec x - 1)/(secx + 1))`

Explanation

To differentiate the given functions, we will use the quotient rule. The quotient rule states that if you have a function in the form of \( \frac{u}{v} \), then the derivative is given by:

\[ \frac{d}{dx}\left(\frac{u}{v}\right) = \frac{v \frac{du}{dx} - u \frac{dv}{dx}}{v^2} \]

### (i) Differentiate \( \frac{\sin x + \cos x}{\sin x - \cos x} \)

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