The arccosine of x is defined as the inverse cosine function of x when -1≤x≤1. Please change the value below and click "Calculate" button to see the results.
The arccosine function is the inverse function of y = cos(x)
Formula: arccosin(y) = cos-1(y)
Arccos Range: between -π/2 and π/2 radians
If the parameter x is outside the range -1 to 1, the results will be 'NaN'.
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 |