To find the 4th derivative of f(x) at x=0, we will use the Maclaurin series expansion of f(x).

To find the 4th derivative of $f(x)$ at $x=0$, we will use the Maclaurin series expansion of $f(x)$.
The Maclaurin series for an even function $f(x)$ is given by:

$$f(x) = f(0) + \frac{f''(0)}{2!}x^2 + \frac{f^{(4)}(0)}{4!}x^4 + \dots$$

We need to find the coefficient of $x^4$ in the Maclaurin series of $f(x)$ and multiply it by $4!$.

Step 1: Determine if $f(x)$ is an even or odd function.
The function is $f(x) = \tan^{-1}\