**MobiApp121 eBook Features**

This is a demo page of the typography, engraving and eBook capabilities of the MobiApp121 Publishing Platform. Musical notation, Latex Maths, Tikz graphics and Tables render and parse through to all formats, including ePub, Mobi (Kindle) and print PDF. Browse through other chapters of this book to see an example of our template driven platform, developed from opensource PressBooks software:

At first, we sample in the ( is odd) equidistant points around :

where is some step.

Then we interpolate points by polynomial

(1)

Its coefficients are found as a solution of system of linear equations:

(2)

Here are references to existing equations: (1), (2).

Here is reference to non-existing equation (??).