подредачил :) 3.5 + (-sqrt(1-x^2-(y-abs(x))^2))*cos(1*((1-x^2-(y-abs(x))^2))), x is from -1 to 1, y is from -1 to 1.5, z is from 1 to 6 3.5 + (-sqrt(1-x^2-(y-abs(x))^2))*cos(45*((1-x^2-(y-abs(x))^2))), x is from -1 to 1, y is from -1 to 1.5, z is from 1 to 6