sqrt(x) = 2
By Lena Spinka at Feb 19 2021
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
By MinuteMaker42 at Jul 23 2021
1.2+(sqrt(1-(sqrt(x^2+y^2))^2) + 1 - x^2-y^2) * (sin (10000 * (x*3+y/5+7))+1/4) from -1.6 to 1.6