Content
Definition
Arccosine (arccos) is the inverse trigonometric function.
Arccosine x defined as the inverse of the cosine x, at -1≤x≤1.
If the cosine of the angle у is х (COS y = x), which means the arccosine x equals y:
arccos x = cos-1 x = y
Note: cos-1x means inverse cosine, not cosine to the power -1.
For example:
arccos 1 = cos-1 1 = 0° (0 work)
arccosine plot
The arccosine function is written as y = arccos (x). The chart in general looks like this:
Arc cosine properties
Below, in tabular form, the main properties of the arc cosine with formulas are presented.
| Property | Formula |
| Additional angles | «> |
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Arc cosine table
| -1 | π | 180° |
| 5p/6 | 150° | |
| 3p/4 | 135° | |
| -1/2 | 2p/3 | 120° |
| 0 | Π / 2 | 90° |
| 1/2 | Π / 3 | 60° |
| Π / 4 | 45° | |
| Π / 6 | 30° | |
| 1 | 0 | 0° |
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