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: <math>\dfrac{Y(s)}{X(s)} = \dfrac{G(s)}{1 + G(s) H(s)}</math>
<math>G(s) </math> is called [[Feedforward#Control|feedforward]] transfer function, <math>H(s) </math> is called [[Feedback#Control theory|feedback]] transfer function, and their product <math>G(s)H(s) </math> is called the [[Open loop transfer function]].
==Derivation==
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