ok, i have a wave packet which is defined between (-pi/(2b)) and (pi/(2b)) as cos(bx), and it's zero everywhere else. here's what i've done so far: i normalized and solved for b, getting pi/2. so now i'm thinking i should calculate the a0, an, and bn series, and add, right? and here is where i'm stuck. how do i go about doing this? what are the limits of integration? and do i just add the results together to get the final fourier transform? any and all attempts at help is much appreciated. thanks a lot!