Differentiate `sqrt((1-x^2)/(1+x^2))` with respect to `x` .

Explanation

To differentiate the function \( y = \sqrt{\frac{1-x^2}{1+x^2}} \) with respect to \( x \), we will follow these steps:

### Step 1: Define the function
Let
\[ u = \frac{1 - x^2}{1 + x^2} \]
Then, we can express \( y \) as:
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