output current of differential pair (Transconductor)

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an_82

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Hello every one

I want to calculate output current of differential pair circuit which is used as a OTA, but I could not obtain. I attached the related paper which claims From eq. (2)-(4) we can obtain the output current of eq. (5), unfortunately I could not obtain the result which they achieved.

I attached the paper.

Please help me to know how can I obtain eq. (5)?
 

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