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hi all, I know I can plot y=x^2 by using command like plot(x^2, x=-2..2);. In this example we have an explicit expression of y. What if we cannot find an explicit expression of y? For example, suppose we do not want to find an explicit expression of y in equation x^2+y^2=1, then how can we plot this circle? by the way, what's the difference between forum and blog here? thanks!

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