Some simple formulas

x=.004*x+y; 
 y=(-1./y - y)/x;

x = x/y -x;
 y = x*x - 0.24; 

x = x*y + 0.357057*x -y; 
y = x + y;

x=-0.999776*y; 
 y=x+0.1*y;

 x=y;
 y=-0.288/y +0.5*y - x;

x=.001*y+y; 
y=x; 

x=-y;
 y=x+y+1/y;  

x= -.127219  + y
y  = .02246817*y/x -x 

x = 0.37363*x*x-1.182076*x+y
y = -x + 1.33173

x=-0.999776*y; 
 y=x+y;

x=y;
y=y*y+x+y; 

x=-y; 
 y=x*x*x-x-y;

x = y - 0.614927
y = x*x - y

x = 0.538999*x-y
y = 1.629151*x -x*x

c0 = 0.7121
d0 = 0.336315
x = c0 - y 
y = d0/(x*x)+x 

x=x*0.6 -y;  
 y=0.1*x*y +x;

a = 0.009556639
b = 0.001269858
c = 0.7225745
d = 1
x = x/(a*x*y + b*(y/x) +c/x + x + d) - y + x
y = x 

x = a*y 
y = x+b*y 

x=-0.999776*y; 
 y=x-y; 

x=-0.999776*y;  
y=x-y;

a = -0.00001
b = -0.240934
c = 0.096143
x = y + a*y*y 
y = b*y*y -x +c

x = -y;
y = -2*x*x*y+2*y;