f-x-y-f-x-y-2f-x-f-y-find-f-x-Q-180407-Altered-

Question Number 180436 by Rasheed.Sindhi last updated on 12/Nov/22

$${f}\left({x}−{y}\right)+{f}\left({x}+{y}\right)=\mathrm{2}{f}\left({x}\right){f}\left({y}\right) \\ $$$$\mathrm{find}\:{f}\left({x}\right) \\ $$$${Q}#\mathrm{180407}\:\left({Altered}\right) \\ $$

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