What is the value of cos 0 degrees?

The value of cos 0 degrees is 1 because cosine measures the horizontal coordinate of a point on the unit circle. At an angle of 0 degrees, the point lies at (1, 0) on the unit circle, where the x-coordinate is 1. Therefore, cos 0 degrees equals 1, which reflects the maximum value of the cosine function at this angle. This fundamental relationship in trigonometry holds true in various contexts and forms a basis for understanding the behavior of cosine in relation to angles.