Khan Academy on a Stick : Hyperbolic trig functions

Khan Academy on a Stick

Trigonometry and precalculus

Graphing lines
Functions and their graphs
Polynomial and rational functions
Exponential and logarithmic functions
Basic Trigonometry
Trig identities and examples
Parametric equations and polar coordinates
Conic sections
Systems of equations and inequalities
Sequences and induction
Probability and combinatorics
Imaginary and complex numbers
Hyperbolic trig functions
Limits

Hyperbolic Trig Function Inspiration
Exploring a motivation for even defining hyperbolic sine and cosine
Hyperbolic Trig Functions and the Unit Hyperbola
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Why they are called hyperbolic trigonometric functions

Intro to hyperbolic trigonometric functions

You know your regular trig functions that are defined with the help of the unit circle. We will now define a new class of functions constructed from exponentials that have an eery resemblance to those classic trig functions (but are still quite different).