If `y=1/2log((1-cos2x)/(1+cos2x)),p rov et h a t(dy)/(dx)=2cos e c2x`

Explanation

To solve the problem step by step, we start with the given function:

### Step 1: Write down the function
Given:
\[ y = \frac{1}{2} \log \left( \frac{1 - \cos 2x}{1 + \cos 2x} \right) \]

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