F(N-k)=\sum_{t=0}^{N-1}f(t)\cos(2\pi\frac{k}{N}t)+j\sum_{t=0}^{N-1}f(t)\sin(2\pi\frac{k}{N}t)=\overline{F(k)}
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  1. http://formula.s21g.com/?F(N-k)%3D%5Csum_%7Bt%3D0%7D%5E%7...
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