TinyMCE4 has no math formula plugin default. This plugin is a formula plugin called “Tinymce4 Formula Editor”, you can use it in your tinymce editor to insert math formula easily.

Features:

Support for multiple formula: Fraction, Script, Radical, Intergral, Operator, Bracket and Function.
Support for special characters, such as greek letters, arrows, relations and scripts.
Responsile for complicated formula.
Easy to use as the MathType.
Pure front-end, no server support.
Save as image.

Installation

Upload the files to the tinymce plugins’ folder.
Update your tinymce configuration to add `leaui_formula` plugin, eg:

tinymce.init({
        selector: "textarea",
        plugins: [
        "leaui_formula",
                "advlist autolink link lists charmap  hr anchor pagebreak",
                "directionality textcolor paste fullpage textcolor" 
        ],
        paste_data_images: true,
        toolbar1: "leaui_formula | styleselect formatselect fontselect fontsizeselect | bold italic underline strikethrough " 
});

Please Note that, you must set paste_data_images to true.

Updates

v2. 16/02/2016 fix not support for latest Chrome

TinyMCE4 Formula Editor