I was wondering how do I actually see what's inside a function, say,
density of t distribution, dt()?

I know for some, I can type the function name inside R and the code will be
displayed.  But for dt(), I get
> dt
function (x, df, ncp, log = FALSE)
{
    if (missing(ncp))
        .Internal(dt(x, df, log))
    else .Internal(dnt(x, df, ncp, log))
}
<environment: namespace:stats>

I am curious because I am doing rejection sampling and want to find a
"bigger" distribution.

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