Chứng minh rằng
$\sqrt[44]{tan1^{\circ}.tan2^{\circ}...tan44^{\circ}}< tan22^{\circ}30{}'< \frac{1}{44}(tan1^{\circ}+tan2^{\circ}+...+tan44^{\circ})$
Chứng minh rằng
$\sqrt[44]{tan1^{\circ}.tan2^{\circ}...tan44^{\circ}}< tan22^{\circ}30{}'< \frac{1}{44}(tan1^{\circ}+tan2^{\circ}+...+tan44^{\circ})$
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