code golf - Catenary Between Two Points (Hanging Chain) - Code

This is one of several challenges left for the community by Calvin's Hobbies. The curve that an idealised hanging rope or chain makes is a catenary. Image by Bin im Garten, via Wikimedia Commons.

Catenary example: Find the distance between the poles

The Hanging Chain (Catenary) Problem

PDF) Architectural.Graphic.Standards.11th

Hanging cables

newtonian mechanics - What cancels out tension in hanging chain? - Physics Stack Exchange

Computer Algebra Recipes

Anatomy of Aircraft & Spacecraft – Introduction to Aerospace Flight Vehicles

The Catenary (hanging chain), how it was first solved.

trigonometry - When a cable is suspended from two points, it hangs in the form of a catenary, the equation of the curve being given by - Mathematics Stack Exchange

code golf - Distance Between Two Points Travelling on a Polar Graph Chart - Code Golf Stack Exchange