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Question Number 33171 by prof Abdo imad last updated on 11/Apr/18
$${let}\:{f}\left({x}\right)=\:\:\frac{\mathrm{1}}{\mathrm{1}−{e}^{{t}} }\:\:.{calculate}\:{f}^{'} \left({x}\right)\:{interms}\:{of}\:{cht} \\ $$