Example for the Tate's theorem, Group cohomology

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Tate's theorem can be found in Milne's book page 81. Can someone give an easy example for that?

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This is the theorem of Tate-Nakayama. It implies local class field theory with $C = \bar{K}^\times$ (see p. 105) and global class field theory with $C$ the idele class group (see p. 198).