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Estudo do sinal de uma função, analisar onde é + e -
como estudo o sinal dessa função:
-2/9x^(4/3)
primeiro devo estudar
-2/9 ————
1/x^(4/3) +++++0++++++
f(x) —–0——
está correto??
como devo fazer caso esteja errado?
alguém poderia me ajudar??
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