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What is the correct way to expand (p

_{3}-p_{4})^{2}where p_{3}and p_{4}are 4-vectors, with metric g_{mu nu}=diag[1,-1,-1,-1], p = [w_{p},**p**], where**p**is 3-vector, and w_{p}= (**p**^{2}+m^{2})^{(1/2)}
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