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This is a LaTeX $latex \int_{-\infty}^x f_X(t)dt$ equation.
Let’s write some R code

[sourcecode language="r"]
x = rnorm(100);
y = rnorm(100);
plot(x, y, type="b", col=2, lwd=2);
[/sourcecode]

Using MathJax should also work for LaTeX equations

[latex]
F(x) = \int_{-\infty}^x f_X(y)dy.
[/latex]

Let see if the inline version of this equation, $latex F(x) = \int_{-\infty}^x f_X(y)dy$, looks better than the above one… It does, big time!

[sourcecode language="r"]
x = rnorm(100);
y = rnorm(100);
plot(x, y, type="b", col=2, lwd=2);
[/sourcecode]