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Frederico
Para todo x ∈ R, a expressão cos( log(x² + 7) / (x⁴ + 5) ) equivale a
a) cos( log(x⁴ + 5) / (x² + 7) )
b) sen( log(x² + 7) / (x⁴ + 5) )
c) - cos( log(x² + 7) / (x⁴ + 5) )
d) sen( log(x⁴ + 7) / (x² + 7) )
e) - cos( log(x⁴ + 7) / (x² + 5) )
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