I'm trying to mirror a function $f(x)$ about the $x=c$ axis. To mirror it about the $x=0$ axis you just have to plot $f(-x)$.
I tried to mirror $f(x) = x^2$ about the $x = c$ axis. And I found that the mirrored function of $f$ is $(x-2c)^2$.
This just works for the $x^2$ function, but I need to mirror any function. How to do that?