i cant answer this problem.

y^vii-14y^vi+80y^v-242y^iv+419y^iii+416y^ii+220y^i-48y=0

y^III-2y^II-21y^I-18y-3=4e^(-t) (MVP)

(d^2 y)/(dx^2 )+y=sec(x)tan(x) (MVP)

y^iii-12y^ii+48y^i-64y-12=2e^4t-32e^(-8t) (MUC)

(d^2 y)/(dx^2 )-2y=5e^(-3x)+e^(-3x) cos(2x)-sin(2x) (MUC)

i need to solve this differential equation to get the general solution. thank you.