Evaluate: `intsqrt((1-sqrt(x))/(1+sqrt(x)))dx`

Explanation

To evaluate the integral \( \int \sqrt{\frac{1 - \sqrt{x}}{1 + \sqrt{x}}} \, dx \), we will follow these steps:

### Step 1: Substitution
Let \( u = \sqrt{x} \). Then, \( x = u^2 \) and \( dx = 2u \, du \).

### Step 2: Rewrite the Integral
Substituting \( u \) into the integral, we have:
\[
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