Arccos Calculator
Arccos(x) calculator. Inverse cosine calculator.
In order to calculate arccos(x) on the calculator:
- Enter the input value.
- Select result type of degrees (º) or radians (rad) in the right combo box.
- Press the = button to calculate the result.
Arccos definition
The arccos function is the inverse function of cos(x).
arccos(x) = cos-1(x)
For example, If the cosine of 30º is 0.5:
cos(30º) = 0.5
Then the arccos of 0.5 is 30º:
arccos(0.5) = cos-1(0.5) = 30º
Arccos table
| x | arccos(x) |
|---|
| degrees | radians |
|---|
| -1 | 180º | π |
| -0.8660254 | 150º | 5π/6 |
| -0.7071068 | 135º | 3π/4 |
| -0.5 | 120º | 2π/3 |
| 0 | 90º | π/2 |
| 0.5 | 60º | π/3 |
| 0.7071068 | 45º | π/4 |
| 0.8660254 | 30º | π/6 |
| 1 | 0º | 0 |
See also