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https://news.ycombinator.com/item?id=3386300sqrt(cos(x))cos(200 x)+sqrt(abs(x))-0.7)(4-x*x)^0.01,sqrt(9-x^2), -sqrt(9-x^2) from -4.5 to 4.5
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sqrt(cos(x))cos(200 x)+sqrt(abs(x))-0.7)(4-x*x)^0.01,sqrt(9-x^2), -sqrt(9-x^2) from -4.5 to 4.5