How to include files js in ionic 2

so i’m trying to include this files js in my ionic proyect, these are for graphing mathematical functions, the thing is that it only shows me the form and not the graphic area
I followed these steps to try to integrate the files:
i includeted in assets/js/math.min.js and assets/plotly-1.35.2.min.js
I suppose it should be added to the index.html but I do not know where:
so do you know whats wrong?

Yes, you are including screen shots of source code in your post.

When you should be using the editor’s ‘</>’ toolbar button to delimit preformatted text:

type or paste code here