Evaluate : `intx^(3)sqrt(x^(2)-4) dx`

Explanation

To evaluate the integral \( \int x^3 \sqrt{x^2 - 4} \, dx \), we can follow these steps:

### Step 1: Rewrite the Integral
Let \( I = \int x^3 \sqrt{x^2 - 4} \, dx \).

### Step 2: Substitute for \( x^2 - 4 \)
We can express \( x^3 \) in terms of \( x^2 \):
\[
...