can you help me

Please help me to solve y''''+y'''-y''-y'=2x+2sinx and then to compare in Simulink environment

[Sam Chak]

Hi @Arman

Based solely on the sign, mathematics indicates that the 4th-order system is unstable regardless of the initial values (which you haven't provided). Are you still interested in solving it further?

[Sam Chak]

@Arman, Please follow the example in the 'dsolve' or 'ode45' documentation page to create the code for the 4th-order system. Afterwards, you can copy and paste the code here by clicking on the indentation icon . We will review it for any errors.

https://www.mathworks.com/help/symbolic/dsolve.html?s_tid=doc_ta#bve5nw0-1

%% Paste your code here
function dydt = fourthOrderSys(t, y)
    dydt(1) = ...;
    dydt(2) = ...;
    dydt(3) = ...;
    dydt(4) = ...;
end

[Arman]

In my course work answer isy= c1+c2e^-x+c3x^e-x+c4^ex+2x-x^2-0.5(sin x +cos x)