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The circle could've been done in one equation
One equation, sure, but not in one valid function (without making it parametric anyways)
x2+y2=1
or, in this case
(x-2)2+(y-2)2=1Not valid functions
A valid function needs to pass the vertical line test
Ok you're right
A that's a single equation alright. But as the previous poster pointed out, it's not a function.
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