A mathematical relationship relating 
to 
and 
.
Argument Addition Relation
See also
Argument Multiplication Relation, Recurrence Relation, Reflection Relation, Translation RelationExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Argument Addition Relation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ArgumentAdditionRelation.html