Arccos45

Do you mean arccos(45) or something else?

• If you mean arccos(45) with real numbers: not defined, since the domain of arccos is [-1, 1].

• If you allow complex values (principal value): arccos(45) = -i ln(45 + sqrt(45^2 - 1)) = -i ln(45 + sqrt(2024)) ≈ -4.50 i.

• If you meant something like arccos(0.45) (or another input), tell me and I’ll compute that.