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��FX = Py / Pd
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��FX[1] = Py[t] / Pd[t] = {Py[0] x (1+Ky)} / {Pd[0] x (1+Kd)}
��= Py[0]/[Pd] x (1+Ky)/(1+Kd) = FX[0] x (1+Ky)/(1+Kd)
���� FX[0] x {1+(Ky-Kd)}
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��(FX[1]-FX[0])/FX[0] = Ky-Kd
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