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質問の意図がいまいちわかりかねるのですが、
γ³=cos(±π)+isin(±π)まではわかったということでしょうか?

cos(π) = -1
cos(-π) = -1
sin(π) = 0
sin(-π) = 0
なのでπの符号がどうであれ-1です
+1の出る余地がありません

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