a)
Ex: Sinus
x = sin(u^8)*5+0.5*cos(u)
y = sin(u)
z = 1
0 <= u <= 2*pi
b)
Cosinus
x = cos(u)
y = 3*u
z = 2
Sinus
x = sin(v)*2*cos(v)
y = 2
z = v
0 <= v <= 2*pi