Question 1 - The equation for all graphs is y:=A*sin(2*f*theta)+2
This graph is occured when legend = 1
This graph is occured when animate = 2
Question 2 - this is a scientific graph from equation y := A*sin(2*f*theta)+2
This graph is occured when legend = 3
Question 3 - 2D, 3D and VRML graph
For 2D graph, the equation that used to create this graph are sin(5*x/t) when t=2..2*Pi
For 3D graph, the equation for this 3D graph are [x*sin(x)*cos(y),x*cos(x)*cos(y),x*sin(y)*cos(x)] when x=-2..10,y=-2..20
For VRML graph, the equation is like 3D graph