Find the angle whose tangent equals a given value, with principal value in degrees or radians.
The inverse tangent (arctan) returns the angle whose tangent equals x. The principal value is in (−90°, 90°) or (−π/2, π/2). Unlike arcsin/arccos, the domain is all real numbers.
Inverse tangent
θ = arctan(x), for any real x
arctan(1) = 45°, because tan(45°) = 1.
No. Unlike arcsin and arccos, arctan accepts any real number — the output is always between −90° and 90° (exclusive).