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arccos-pi-2-1-2-arccos-4-5-

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Question Number 146587 by mathdanisur last updated on 14/Jul/21
arccos((π/2) - (1/2) arccos (4/5)) = ?
$${arccos}\left(\frac{\pi}{\mathrm{2}}\:-\:\frac{\mathrm{1}}{\mathrm{2}}\:{arccos}\:\frac{\mathrm{4}}{\mathrm{5}}\right)\:=\:? \\ $$

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