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tried this in wolfram alpha and it only shows half the heart :/
If you're using the alternate form "x^2 + (y- x^(2/3))^2 = 1" then you are limiting x and y to positive values which explains why you only get part of it.
I think you get a better shape if you use the fifth root rather than the cube root: http://www.wolframalpha.com/input/?i=plot+x%5E2%2…
And it's also good as an inequality as < 1 http://www.wolframalpha.com/input/?i=plot+x%5E2%2…
i like it
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