
z = Cos(x+2*pi*cos(y/2))+Cos(y+2*pi*Cos(x/2)) x = 9 to 9, y = 9 to 9 

z = (x*xy*y)^2/(x*x+y*y)
x = 9 to 9, y = 9 to 9
PsuedoBessell function 

Surface plot of z = 4*(x*xy*y)^2/(x*x+y*y)
x = 5 to 5, y = 5 to 5
PsuedoBessell function 

z = Cos(x+2*pi*Cos(y/2))
x = 2pi to 2pi, y = 2pi to 2pi 

z = Exp(Sin(x)*Sin(y)*3)/4
x = 2pi to 2pi, y = 2pi to 2pi 

z = Cos(x*xy*y)
x = pi to pi, y = pi to pi 

x = 2*Cos(t) + Sin(2*t)
y = Sin(t) + Cos(2*t)
z = t*Cos(t)/10
t = 30 to 30


x = 2*Cos(t) + Cos(2*t)
y = 2*Sin(t) + Sin(2*t)
z = t*Sin(t)
t = 50 to 50


r = Sqr(4*Cos(a + b))
a = 0 to 2pi, b = 0 to 2pi


r = Sin(2*a) + Sin(2*b)
a = 0 to 2pi, b = 0 to 2pi


r = Sin(a) + Sin(b)
a = pi to pi, b = pi to pi


r = 1/Sqr(a*a + b*b)
a = 0 to 2pi, b = 0 to 2pi


Red/blue anaglyph
r = sin(a + b)  cos(a + b)
a = 0 to 2pi
b = 0 to 2pi


x=cos(t) + t^2*sin(t)
y=sin(t) + t^2*cos(t)
t = 8pi to 8pi


z = e^(r*r)*(sin(2*r)r*cos(4*a))
r = 0 to 2
a = 2pi to 2pi


r =2
a = t
z =cos(7*t)
t = pi to pi
