He fourier series for an arbitrary periodice function with period 21, is given by (1)= , cos for the particular periodic functiona shown in the figure the value

he Fourier series for an arbitrary periodice function with period 21, is given by (1)= , cos For the particular periodic functiona shown in the figure the value of ag is f) (a) 0 (b) 0.5 (c) 1 d) 2 inseribed