first you must understand the equation you need to solve, then know how to write it with the right syntax and finally plot the required results.
i think the V is the max value and its constant so i will define it as vaule
V_max=10; % max value of V is 10
then the value of t i suppose it value from 1 to 90 with step of 1
t=1:1:90;
and easily we can write the equation
vo=(2+0.1961*cos(0.1*t-0.1961)+0.003998*cos(15*t-1.5375)+0.001667*cos(300*t-1.5691))*V_max;
and plot t with vo
plot(t,vo)
