Google Valentine's Day Easter Egg: An algebraic equation of love

Google is embracing Valentine's Day today not only in its homepage but also in Google Search, if you type the algebraic equation below into Google Search it will produce an algebraic equation plots several different functions on a graph that forms the shape of a heart.

To try it out yourself, just type or paste this algebraic equation into Google Search:
sqrt(cos(x))*cos(300x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5 

Source: Mashable

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