CALCULATOR
Arccos Calculator (Inverse Cosine)
arccos (inverse cosine). Example: Dimensionless input: 0.5 number gives 60 degrees. Principal branch only: arcsin −90..90°, arccos 0..180°, arctan −90..90°. No complete periodic solution set. Elementary arithmetic over the accepted finite domain. No statistical population inference, supplied-data validity claim or specialist recommendation.
Principal branch only: arcsin −90..90°, arccos 0..180°, arctan −90..90°. No complete periodic solution set. Elementary arithmetic over the accepted finite domain. No statistical population inference, supplied-data validity claim or specialist recommendation. Derivation: Principal inverse angle is converted from radians to degrees.
Accepted inputs: Dimensionless input: -1 to 1 number.
How the calculation works
principal angle = acos(value)×180/π
Worked example
With dimensionless input 0.5 number, arccos (inverse cosine) is 60 degrees.
Assumptions and limits
Principal branch only: arcsin −90..90°, arccos 0..180°, arctan −90..90°. No complete periodic solution set. Elementary arithmetic over the accepted finite domain. No statistical population inference, supplied-data validity claim or specialist recommendation. Derivation: Principal inverse angle is converted from radians to degrees.