Find the points of local maxima or minima for `f(x) =" sin "2x -x, x in (0,pi)`

Explanation

To find the points of local maxima or minima for the function \( f(x) = \sin(2x) - x \) in the interval \( (0, \pi) \), we will follow these steps:

### Step 1: Find the first derivative of \( f(x) \)
We start by differentiating the function:

\[ f'(x) = \frac{d}{dx}(\sin(2x)) - \frac{d}{dx}(x) \]
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