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7-8-7-cos-arcsin-3-21-14-4pi-3-3-8cos-4pi-7-1-




Question Number 140166 by mathdanisur last updated on 04/May/21
((7−8(√7)cos(((arcsin(((3(√(21)))/(14)))+4π)/3)))/3) + 8cos(((4π)/7))=1
$$\frac{\mathrm{7}−\mathrm{8}\sqrt{\mathrm{7}}{cos}\left(\frac{{arcsin}\left(\frac{\mathrm{3}\sqrt{\mathrm{21}}}{\mathrm{14}}\right)+\mathrm{4}\pi}{\mathrm{3}}\right)}{\mathrm{3}}\:+\:\mathrm{8}{cos}\left(\frac{\mathrm{4}\pi}{\mathrm{7}}\right)=\mathrm{1} \\ $$

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