Many of the identities are similar (but often have sign differences) to those in Trigonometry. Much of this can be understood with only some familiarity with College Algebra, however. Hanging an inelastic rope between two points. [The actual arc of the rope turns out to be from the hyperbolic trig function cosh. Know More About How to Find the Derivative at a Point Hyperbolic Trigonometry There are two common approaches to this material: