# The cosh Function

| The y = cosh x function is defined as
cosh x | = | e x + e – x 2
--- | --- | ---
|  | The other hyperbolic functions are
sinh x | = | e x – e – x 2
--- | --- | ---
tanh | = | e x – e – x e x + e – x
| What they look like you can find out for yourself by activating the JAVA module below
|  | Here a few examples as how to write equations
cos(x) |  | exp(x)
--- | --- | ---
cos(x*2) |  | exp(1/x)
cos(x/40) |  | x^2
cosh(x) |  | 1/x^2
cosh(40*x) |  | 1/(x^3+10)
|  | 1/(exp(x-20)+1)

With frame

2.3.3 Shockley-Read-Hall Recombination

Peierls Instability

© H. Föll (Semiconductors - Script)