1. Visit Google.com.
2. Copy & paste below code in search field:
(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
3. Hit enter. Now you will see a beautiful Heart shape graph in search result!
You can try your own by modifing above given equation such as replacing cos by sine, tan by cot also replacing float,integer values to another once i.e 4.5 with 9.6 etc. You will get different figures with respect to equestions.