Please show me what I am missing here - code shown was given as example. Please also show me how to plot for b). Currently my best guess is a) is 30 and for b) I need call to plot(dYdt) which are likely both wrong.

1. (a) What is the period of the forced oscillation? What is the numerical value (modulo 2 ) of the angle defined by (4) ? (b) In this question you are asked to modify the file LAB06ex1.m in order to plot the complementary solution of (1), that is, the first term in (2). First define in the file the angle (alpha) using (4), then evaluate the complementary solution yc by subtracting the quantity Ccos(t) from the numerical solution y. Plot the resulting quantity. Does it look like an exponentially decreasing oscillation? Why or why not? Include the modified M-file and the corresponding plot