(sqrt(cos(x))*cos(300*x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5
x = -2:.001:2; y=(sqrt(cos(x)).*cos(200*x)+sqrt(abs(x))-0.7).*(4-x.*x).^0.01; plot(x,y,’r’);
y = |sin(x)| + 5*exp(-x^100)*cos(x) from -3 to 3
:–)