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0.0 hrs last two weeks / 5.4 hrs on record (4.4 hrs at review time)
Posted: 20 Apr, 2023 @ 7:45pm

O número de raízes reais da equação 2. cos² 𝑥 + 3. cos 𝑥 + 1 = 0 no intervalo
]0, 2𝜋[ é
a) 0
b) 1
c) 2
d) 3
e) 4 (mais fácil que dormir com sono)
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