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If You draw a small signall circuit You will see a symetry and whole small-signal circuit will reduce to current sources \[g_{m1} V_{in}\], \[-g_{m6} V_{in}\] and resistor \[1/g_{m3}\]. Then your gain should be equal to \[K_V=\frac{g_{m6}-g_{m1}}{g_{m3}}\]
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