Question Number 121598 by TITA last updated on 09/Nov/20
$${find}\:{the}\:{solution}\:{of}\:{f}\left({x},{y},{z}\right)=\left(\mathrm{sin}\:{x}\right)\left(\mathrm{cos}\:{y}\right)\left(\mathrm{tan}\:{z}\right) \\ $$$${for}\:\mathrm{0}\leqslant{x},{y},{z}\leqslant\frac{\Pi}{\mathrm{4}}\: \\ $$