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Question Number 89718 by abdomathmax last updated on 18/Apr/20
$${let}\:{f}\left({x}\right)=\sqrt{\mathrm{2}{x}+\mathrm{1}}−\sqrt{\mathrm{2}{x}−\mathrm{1}} \\ $$$${find}\:{f}^{\left({n}\right)} \:{by}\:{recurence} \\ $$