The cosine of 30 degrees, written as cos(30°), is equal to √3/2 in fraction form.
In essence, the cosine of 30 degrees (cos 30°) represents the ratio of the adjacent side to the hypotenuse in a 30-60-90 right triangle. The exact value is the square root of 3, divided by 2. This is an irrational number, approximately equal to 0.8660254037.
