For the following equations, find the equilibria and sketch the phase line. Determine the type and stability of all the equilibria. a) u' = u(3-u). b) u' = 2u(1-u) - zu. c) u' = (4-u) (2-u). d) u'- u - cos u. (Hint: plot u and cos u separately.) = e) u' eu. = - COS U.