For (c), let the initial condition assume a trigonometry form like the following: c(x,0) = Co 1+ Acos(X x - XO where Co is the mean concentration, A is the amplitude of d trigonometric spatial concentration profile, and Xo, d are parameters defining the location and width of the trigonometric function. Please find Xo and d that make the initial condition consistent with the boundary conditions, as well as hitting maximum halfway in the tube. Sketch the initial concentration profile c(x, 0)