please answer all parts solving using MATLAB code for all parts

(12) Find favier senes one peoond (T=.25) do=.2(/2)(.2)(8)=4 an=2/T1T40tcosn0tdt =T2[n040tsinnt]2n=0T+T2[(n0)240cosn0]0T bn=T20T40tsinn0tdt=T2[n040tcosn0t]T0+T2[(n0)240sinn0t]0Tbn=n080=n8f(t)=4n8=1(n1sin10nt)d=f(t)=48sin10t28sin20t38sin30t48sin40t58sin50t. I- Using your Fourier series result of Problem No.2, a) plot the fundamental and the first three harmonics in one figure. b) plot the sum of the harmonics including the average value (DC content) as n goes from 1 to 9. (where n represents the summation index in the Fourier series expansion.) c) Comment and explain the results of a and b above. Ensure to demonstrate understanding. II- Using the symbolic toolbox, derive expressions for a0,an and bn and compare results to those of Problem No.2