(EsPCEx - 2014)
Seja \(\beta =\frac{1}{2} . \frac{\log_{10}3}{\log_{10}3 - \log_{10}7 }\).O conjunto solução da desigualdade \(3^{\cos \left ( x \right )} \leq \left ( \frac{3}{7} \right )^{\beta }\) no intervalo [0,2\(\pi\)), é igual a:
\([0, \frac{\pi}{3})\)
\([\frac{\pi}{3},\frac{5 \pi}{3}]\)
\([\frac{\pi}{3}, 2\pi]\)
\([\frac{\pi}{3}, 2\pi)\)
\([\frac{3\pi}{2}, 2\pi)\)