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preuve-a-HH-1-H-b-HH-H-c-H-1-H-

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Question Number 163885 by SANOGO last updated on 11/Jan/22
preuve a)HH^(−1) =H b)HH=H c)H^(−1) =H
preuvea)HH−1=Hb)HH=Hc)H−1=H

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