(adsbygoogle = window.adsbygoogle || []).push({}); I can't do the derivative 7.31 at page 221. I try to do the derivative dΣ/dpslash, but my result is different from 7.31

Someone can help me writhing the right derivative?

Thank you in advance!

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# A Peskin Shroeder quantum field 7.31 pag 221

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