Evaluate: `intlog(x+1)\ dx`

Explanation

To evaluate the integral \( I = \int \log(x+1) \, dx \), we can follow these steps:

### Step 1: Substitution
Let \( t = x + 1 \). Then, the differential \( dt = dx \).

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