Arccos (cos⁻¹) Calculator
Value (must be in [−1, 1] for sin/cos)
Arccos (inverse cosine, cos⁻¹) returns the angle whose cosine equals the input value. The output is in the range [0°, 180°] or [0, π] radians.
- 1arccos(x) returns θ where cos(θ) = x
- 2Domain: x ∈ [−1, 1]
- 3Range: [0°, 180°] or [0, π] radians
- 4arccos(0.5) = 60°, arccos(−1) = 180°
arccos(0.5)=60° or π/3 radians
arccos(0)=90° or π/2 radians
arccos(−0.5)=120° or 2π/3 radians
| x | arccos(x) degrees | arccos(x) radians |
|---|---|---|
| -1 | 180° | π |
| −0.5 | 120° | 2π/3 |
| 0 | 90° | π/2 |
| 0.5 | 60° | π/3 |
| 1 | 0° | 0 |
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