What is the value of cos(0°)?

The value of cos(0°) is defined in trigonometry as the x-coordinate of a point on the unit circle corresponding to an angle of 0 degrees. At this angle, the point on the unit circle is (1, 0), where the x-coordinate is 1 and the y-coordinate is 0. Therefore, cos(0°) is equal to 1, making this the correct answer.

In the context of the unit circle, as you measure angles starting from the positive x-axis, an angle of 0 degrees points directly along the x-axis to the point (1, 0). The cosine function, which represents the horizontal coordinate in this context, confirms that cos(0°) = 1.

The other options do not align with this interpretation of the cosine function; thus, they do not represent the value of cos(0°).