December 2019 1 236 Report
Considere a expressão

\displaystyle \mathbf{5^{\log_5 (\sin 300^o \cdot \tan 1^o \cdot \tan 2^o \cdot ... \cdot \tan 88^o \cdot \tan 89^o \cdot \cos 120^o)}}

Qual é o seu valor:

a) \mathrm{\frac{\sqrt{3}}{2}}
b) \mathrm{\frac{\sqrt{3}}{4}}
c) \mathrm{\frac{1}{4}}
d) \mathrm{\frac{3}{4}}
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