1. The electronic circuit in vacuum tubes has been modelled as Van der Pol equation of t dy E (y21)E+y=, #:41- The parameter n represents a damping indicator and y(t) is a voltage across the capacitor at time, t. Suppose that ,u = 0.5 1with boundary conditions MU) = U and M2) = 1. (a) [20 points) Given the rst initial guess :0 = 0.3 and the second initial guess so = [1.75, approximate the solution of y(t) using the shooting method 1with a step size of h = 0.4