This tutorial demonstrates how to plot the cosine function cos(x) in Python using Matplotlib and NumPy, creating a clean cosine wave graph for beginners. Matplotlib is a Python plotting library whose pyplot module makes it easy to create a cos(x) plot in Python, giving you MATLAB‑style plotting capabilities with simple code. NumPy is essential for numerical operations in Python, and here we utilize it to generate the array of x-values and calculate the cosine values efficiently. This combination is creating a wide variety of scientific and data visualizations in Python.