Find the equilibrium points in the dynamics of the following systems. Analyse the stability of each equilibrium point, and for case (i) also provide the bifurcation diagram.
(i) ḓ = rx - x^3
(ii) ḓ = - cos(x + b)
(iii) ḓ = 3x - x^2 - 2xy, ẏ = 2y - y^2 - xy
For the case (iii) summarise your results in the form of a table, with fixed points horizontally, and A, τ, Δ, λ1, and λ2 vertically.