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Dada a função y=ln[a^{ln(tg x)}], onde 0<α<1. Então, y≥0 se:
A) π/2<x<πe< x<2π B) 0<x≤π/2 e π<x<3π/2 C) 0<x≤π/4 e π<x≤5π/4 D) 0<x≤π/4 e π<x<3π/2 E) π/2<x≤π e 3π/2<x≤2π
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