A Peskin Shroeder quantum field 7.31 pag 221

dosantos86
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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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Show your attempt here. (No one can diagnose your problem if you don't show your work.)
 
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