cos 0°
1
The value of the cosine of 0 degrees is 1.
In general, the cosine function represents the ratio of the adjacent side of a right triangle to its hypotenuse. When the angle is 0 degrees, the adjacent side and the hypotenuse coincide and have the same length. Therefore, the ratio is 1.
Another way to think about it is that when an angle is 0 degrees, it lies on the positive x-axis of the coordinate plane. The x-coordinate of any point on the x-axis is equal to its distance from the origin. Since the distance of the point from the origin is the same as the length of the adjacent side of the corresponding right triangle, the cosine of 0 degrees is equal to the ratio of the adjacent side to the hypotenuse, which is 1.
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