Q3: Matlab exercise: Let we have the Heat equation VI un = Uyyn -1sysl, x>0 u(0, y) = cos y, -lsysi u(x,-1) = u(x,1)=e* cos1 x>0 a)Solve with Explicit method from x=0 to x=0.5 with h=0.1 and k=0.005> b) graph the Approximation solution and exact solution u(x, y) = e cos y