Arccos(x) calculator. Inverse cosine calculator.
The arccosine function is the inverse function of cos(x).
arccos(x) = cos-1(x)
For example, If the cosine of 60° is 0.5:
cos(60°) = 0.5
Then the arccos of 0.5 is 60°:
arccos(0.5) = cos-1(0.5) = 60°
| x | arccos(x) | |
|---|---|---|
| degrees | radians | |
| -1 | 180° | π |
| -0.8660254 | 150° | 5π/6 |
| -0.7071068 | 135° | 3π/4 |
| -0.5 | 120° | 2π/3 |
| 0 | 90° | π/2 |
| 0.5 | 60° | π/3 |
| 0.7071068 | 45° | π/4 |
| 0.8660254 | 30° | π/6 |
| 1 | 0° | 0 |