Show that r = 1 () and r = 2 () define the same curves in polar coordinates if 1 () =

Show that r = ƒ₁(θ) and r = ƒ₂(θ) define the same curves in polar coordinates if ƒ₁(θ) = −ƒ₂(θ +π). Use this to show that the following define the same conic section: