[R] Question about autocomplete Keyboard Shortcut in R Markdown Latex

[Tao Z]

Hi, 

In R, we know how to autocomplete a function name or some arguments in the function. I usually use “Tab” to achieve this. 
But when I was preparing my math homework using R Markdown, I want to achieve similar results: for example, 

I want to autocomplete $\frac{}{}$ when I only typed $\fr$. I tried “Tab or Command+Space”, but none of them work. 

Does anyone know if we have autocomplete option for R markdown latex? If we do, what keyboard should I use? Thanks



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