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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]