If angles A,B,C are in AP,then 2cos[a-c/2]
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Answer:
dr66rx6ez6rze6z5eze5z6eze6z6ez6ez6eze6z6e
and e6z6rx6rx6rx7rx447tx7rx7rz6eze6ze5ze6ze6z36zeez6ez6ez66zrz66ez6r 6rx7rx7
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