x=1.75*sin(u)*cos(v)+2*u
y=3*v*cos(u)* 2*v*u
z=2*v*u
minu= -6 maxu=20 steps=500
minu=-10 maxu= 15 steps=200
x= u * cos (v)
y= u * v-5
z=cos (u) * v
minu= -6 maxu=10 steps=400
minu=-40 maxu= 50 steps=500