Batman Equation

I think all of us know that last year Google added the Graph engine where google can solve function equation.
Now have you heard of Batman equation?
wysiwyg image

Batman equation is the equation will gives us the batman symbol when we plot it in Graph sheet!
A geek named Roland Mieslinger done this batman equation in Google function plotter and to try this just copy & paste below code in Google Search!

Note: Without quotes!!!