Approximate a Derivative at a Point in C

# Introduction

In this lab, we will learn how to approximate the derivative of a function at a specific point using the C programming language. We will start by defining a simple quadratic function, then use a small value `h` to compute the numerical derivative using the difference method. Finally, we will print the approximate derivative. This lab aims to provide a practical understanding of derivative approximation, which is a fundamental concept in calculus and analytical geometry.