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Looking on solving equation 2.34 I am stuck at the fourth line. What is the calculation to do to go from:

[tex] \delta^{(3)} (p'- q') \gamma (1 + \beta \frac{dE}{dp_3}) [/tex]

to

[tex] \delta^{(3)} (p'- q') \frac{\gamma}{E} (E + \beta p_3). [/tex]

Many thanks for your help!!

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# Peskin page 23

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