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Couth and uncouth function pairs

· John Cook · May 21, 2026, 5:50 p.m.
Math Special functions Complex Analysis mathematics functions circular functions hyperbolic functions
Summary
This blog post discusses the properties of circular and hyperbolic functions, particularly focusing on their lack of invertibility and the implications this has for mapping points in the domain to points in the range.
Read full post on www.johndcook.com →
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