\[x = 3y+4\]

This is a test: \(a\), \(b\), \(c=3x+5\). End of the test.

shinyUI(
  navbarPage("",
             tabPanel("ReadMe 1",  withMathJax(), includeMarkdown("ReadMe.Rmd")),
             tabPanel("ReadMe 2", includeMarkdown("ReadMe.Rmd")),
             tabPanel("ui.R", pre(includeText("ui.R"))),
             tabPanel("server.R", pre(includeText("server.R"))),
             tabPanel("ReadMe.Rmd", pre(includeText("ReadMe.Rmd")))
  )
)

shinyServer(function(input, output){
  
})

---
title: "Test Latex"
output:
  html_document:
   mathjax: "http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"
runtime: shiny
---
               

$$x = 3y+4$$

This is a test:  $a$, $b$, $c=3x+5$.  End of the test.