1. The problem statement, all variables and given/known data Evaluate INT(|X(t)|^2) dt using parsevals theorem where x(t) = (sin(t)cos(10t))/(pi*t) 2. Relevant equations parsevals theorem: int(|f(t)|^2 dt = (1/2*pi)INT(|F(W)|^2 dw 3. The attempt at a solution So I've tried several attempts at this problem and this is my latest: first I use the fact that sin(x)*cos(y) = (sin(x+y)+sin(x-y)) /2 to get sin(t)cos(10t)/pi*t = (sin(t+10t) + sin(t - 10t))/(2*pi*t) then I split it up into : sin(11t)/2t*pi + sin(-9t)/2t*pi then what I was going to do was take the fourier transform of each function here however, I can't figure out how in the world to take the fourier transform of sin(t)/t anyone have any ideas? thanks!