Please help me

A function is defined over (0, 3) by f (20 ) = = *+1. We then extend it to an even periodic function of period 6 and its graph is displayed below. 2.57 2- 0.51 - 5 UI - 10 15 -0.5- X The function may be approximated by the Fourier series f (2 ) = ap + 20 En-1 (an cos ( nix) + on sin (nxx where I is the half-period of the function. Use the fact that f(x) sin L is an odd functions, enter the value of bn in the box below. bn = 0 , for n = 0, 1, 2,... Hence besides the constant term, the Fourier series made up entirely of cosines. Calculate the following coefficients of the Fourier series and enter them below in Maple syntax. a2k-1= azk