Google is not only a powerful search engine but it comes with a lot of fun too.
Just type this in search box
(sqrt(cos(x))*cos(200*x)+sqrt(abs(x))-0.7)*(4-x*x)^0.1, sqrt(9-x^2),-sqrt(9-x^2) from -4.5 to 4.5
You will see something like this
amazing....
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