F(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)
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  1. http://formula.s21g.com/?F(k)%3D%5Csum_%7Bt%3D0%7D%5E%7BN...
  2. https://maekawa-yoshimiki-1119.hatenablog.com/entry/2017/...
  3. http://formula.s21g.com/
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