Plot the solution of the following second-order ODE
ÿ+1.5 (y²-1) ÿ+y=0
on the interval 0 < t < 30 for initial conditions y(0) = 0.5 and y(0) = 0.
2. Plot the solution of the following second-order ODE
ÿ +0.25g-y+y³ = 0.4 cost
on the interval 0 ≤t≤ 100 for initial conditions y(0) = y(0) = 0.