Point doubling- Adding a point to itself Point doubling Form the tangent in Point P(x,y) r=P+ P R R 221 -3 -2 -1 0 1 2 3 -4 -3 -2 -1 0 1 2 3 4 R = P + P Point Doubling: Form the tangent in Point P(x,y) R' R P Point Doubling – Adding a point to itself