Respostas

2014-06-09T12:01:08-03:00
Tg(90°)=∉=tg(-90°),    \lim_{n \to \ \ \frac{ \pi}{2}^- } tg_(n)=+infty\neq  \lim_{n \to \ \ \frac{ \pi}{2}^+ } tg_(n)=-infty        Logo:  \lim_{n \to \ \frac{ \pi }{2}} tg_(n) =∉
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