<< HighEnergyPhysics`fc`

FeynCalc 4.1.0.3b     Evaluate ?FeynCalc for help or visit www.feyncalc.org

\(\(
x = GA[5] . GS[t] . GS[z]\)\)

r1 = Tr[DiracSlash[p, k, d, c] . x]

\(\(r2 = Tr[x . DiracSlash[p, k, d, c]]
\)\)

r1 - r2 // FullSimplify