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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

$${preuve} \\ $$$$\left.{a}\right){HH}^{−\mathrm{1}} ={H} \\ $$$$\left.{b}\right){HH}={H} \\ $$$$\left.{c}\right){H}^{−\mathrm{1}} ={H} \\ $$

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