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1. (sqrt(cos(x))*cos(75x)+sqrt(abs(x))-.7)*(4-x*x)^.2, sqrt(9-x^2), -sqrt(9-x^2) from -4.5 to 4.5, -x
2. (sqrt(cos(x))*cos(200*x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01,sqrt(9-x^2),-sqrt(9-x^2)
3.  (sqrt(cos(x))*cos(200x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(9-x^2), -sqrt(9-x^2) from -4.5 to 4.5
4.  abs(x)-(1-x^2)^(1/2), abs(x)+(1-x^2)^(1/2), x+ 0.25 from -3 to 3
5.  ((sqrt(cos(x))*cos(500*x)+sqrt(abs(x))-0.4)*(4-x*x)^0.1
6.  sqrt(1-(abs(x)-1)^2), arccos(1-abs(x))-pi